fc-selenite: src/cs/system/main/gcc/bootentry.S annotate

author	Mychaela Falconia <falcon@freecalypso.org>
date	Fri, 20 Jul 2018 23:14:00 +0000
parents
children	2de9e5f46550

rev	line source
89 b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	1 /*
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	2 * This assembly module is our counterpart to TI's int.s: all boot entry
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	3 * point code that needs to be at the beginning of the flash resides here.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	4 */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	5
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	6 #include "asm_defs.h"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	7 #include "fc-target.cfg"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	8
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	9 #if defined(FLASH) && !defined(CONFIG_TARGET_COMPAL)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	10 /*
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	11 * Put something sensible in the boot ROM overlay area, just for the
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 * heck of it, or for extra robustness.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14 .section bootrom.overlay,"ax",%progbits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 .code 32
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16 .org 0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17 b BootROM_disabled_entry
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 #include "vectors.S"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	19 BootROM_disabled_entry:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	20 /* copy the boot ROM switch code to IRAM and jump to it */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	21 ldr r4, =__romswitch_flash_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	22 ldr r5, =__romswitch_ram_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	23 ldr r2, =__romswitch_size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	24 1: ldr r0, [r4], #4
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	25 str r0, [r5], #4
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	26 subs r2, r2, #4
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	27 bhi 1b
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	28 ldr pc, =__romswitch_ram_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	29
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	30 .section bootrom.switch,"ax",%progbits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	31 .code 32
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	32 .org 0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	33 @ enable the Calypso boot ROM
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	34 ldr r1, =0xFFFFFB10
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	35 mov r2, #0x0100
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	36 strh r2, [r1]
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	37 @ jump to it!
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	38 mov pc, #0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	39 #endif
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	40
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	41 .section .inttext,"ax",%progbits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	42 .code 32
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	43
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	44 #ifdef FLASH
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	45 .org 0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	46 #ifndef CONFIG_TARGET_COMPAL
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	47 /* sane targets with Calypso boot ROM enabled by the PCB wiring */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	48 /* provide the necessary magic words for the boot ROM */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	49 .word 0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	50 .word _Firmware_boot_entry
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	51 #elif defined(CONFIG_TARGET_C139) \|\| defined(CONFIG_TARGET_C11X)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	52 /*
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	53 * On this target we'll put a patched version of Compal's boot code in
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	54 * flash sector 0 (the brickable one); the main fw images will then be
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	55 * flashed starting at 0x10000, which is where our modified boot code
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	56 * expects them to be. The interface between our hacked boot code and
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	57 * the main fw has been made to mimic TI's TCS211 reference fw.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	58 */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	59 #include "vectors.S"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	60 .org 0x58 /* put _Firmware_boot_entry at 0x10058 */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	61 #elif defined(CONFIG_TARGET_C155)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	62 /*
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	63 * On this target the hand-off point between the bootloader and the main
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	64 * fw image coincides with a flash erase block boundary, thus we can reuse
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	65 * the original bootloader without having to reflash the brickable sector
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	66 * at all. The following bits will appear at 0x20000.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	67 */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	68 .asciz "FreeCalypso firmware for C155/156 target"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	69 .org 0xE0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	70 /* C155/156 bootloader jumps here */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	71 b _Firmware_boot_entry
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	72 #include "vectors.S"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	73 #else
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	74 #error "Unsupported flash boot configuration"
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	75 #endif
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	76 #endif
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	77
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	78 /* definitions from TI's int.s */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	79
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	80 #define IRQ_STACK_SIZE 128
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	81 #define FIQ_STACK_SIZE 512
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	82 #define SYSTEM_SIZE 1024
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	83 #define TIMER_SIZE 1024
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	84 #define TIMER_PRIORITY 2
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	85
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	86 .globl _Firmware_boot_entry
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	87 _Firmware_boot_entry:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	88 @ TI's code from int.s follows
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	89
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	90 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	91 @ Configure DPLL register with reset value
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	92 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	93 ldr r1,DPLL_CNTRL_REG @ Load address of DPLL register in R1
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	94 ldrh r2,DPLL_CONTROL_RST @ Load DPLL reset value in R2
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	95 strh r2,[r1] @ Store DPLL reset value in DPLL register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	96
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	97 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	98 @ Wait that DPLL goes in BYPASS mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	99 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	100 Wait_DPLL_Bypass:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	101 ldr r2,[r1] @ Load DPLL register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	102 and r2,r2,#1 @ Perform a mask on bit 0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	103 cmp r2,#1 @ Compare DPLL lock bit
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	104 beq Wait_DPLL_Bypass @ Wait Bypass mode (i.e. bit[0]='0')
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	105
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	106 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	107 @ Configure CNTL_ARM_CLK register with reset value: DPLL is used to
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	108 @ generate ARM clock with division factor of 1.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	109 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	110 ldr r1,CNTL_ARM_CLK_REG @ Load address of CNTL_ARM_CLK register in R1
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	111 ldrh r2,CNTL_ARM_CLK_RST @ Load CNTL_ARM_CLK reset value in R2
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	112 strh r2,[r1] @ Store CNTL_ARM_CLK reset value in CNTL_ARM_CLK register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	113
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	114 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	115 @ Disable/Enable the DU module by setting/resetting bit 11 to '1'/'0'
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	116 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	117 ldr r1,EXTRA_CONTROL_REG @ Load address of Extra Control register CONF
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	118 ldrh r2,ENABLE_DU_MASK @ Load mask to write in Extra Control register CONF
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	119 ldrh r0,[r1] @ Load Extra Control register CONF in r0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	120 and r0,r0,r2 @ Enable DU module
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	121 strh r0,[r1] @ Store configuration in Extra Control register CONF
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	122
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	123 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	124 @ Disable all MPU protections
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	125 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	126 ldr r1,MPU_CTL_REG @ Load address of MPU_CTL register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	127 ldrh r2,MPU_CTL_RST @ Load reset value of MPU_CTL register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	128 strh r2,[r1] @ Store reset value of MPU_CTL register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	129
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	130 @ MEMIF timing setup
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	131
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	132 ldr r1,addrCS0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	133 ldrh r2,CS0_MEM_REG @ ROM initialization
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	134 strh r2,[r1] @ CS0
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	135
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	136 ldrh r2,CS1_MEM_REG @ RAM Initialization
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	137 strh r2,[r1,#2] @ CS1
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	138
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	139 ldrh r2,CS2_MEM_REG @ RAM Initialization
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	140 strh r2,[r1,#4] @ CS2
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	141
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	142 ldrh r2,CS3_MEM_REG @ Parallel I/O on B-Sample
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	143 strh r2,[r1,#6] @ CS3 (unused on EVA4?)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	144
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	145 ldrh r2,CS4_MEM_REG @ Latch on B-Sample
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	146 strh r2,[r1,#0xa] @ CS4 (unused on EVA4)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	147
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	148 ldrh r2,CS6_MEM_REG @ Internal SRAM initialization
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	149 strh r2,[r1,#0xc] @ CS6 Internal RAM
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	150
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	151 ldrh r2,CS7_MEM_REG @ Internal SRAM initialization
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	152 strh r2,[r1,#0x8] @ CS7 Internal Boot ROM
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	153
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	154 ldrh r2,CTL_MEM_REG @ API-RHEA configuration
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	155 strh r2,[r1,#0xe]
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	156
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	157 @ enable ADD22
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	158
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	159 ldr r1,EX_MPU_CONF_REG
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	160 ldrh r2,[r1]
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	161 ldr r0,EX_FLASH_VALUE
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	162 orr r0, r0, r2
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	163 strh r0,[r1]
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	164
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	165 /* Ensure that the processor is in supervisor mode. */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	166
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	167 MRS a1,CPSR @ Pickup current CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	168 BIC a1,a1,#MODE_MASK @ Clear the mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	169 ORR a1,a1,#SUP_MODE @ Set the supervisor mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	170 ORR a1,a1,#LOCKOUT @ Ensure IRQ and FIQ interrupts are
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	171 @ locked out
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	172 MSR CPSR,a1 @ Setup the new CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	173
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	174 /*
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	175 * FreeCalypso Selenite: if this is a flash build,
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	176 * copy IRAM code and .data from flash to RAM.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	177 */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	178
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	179 #ifdef FLASH
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	180 /* copy iram.text to where it's supposed to be */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	181 ldr r8, =__iramtext_flash_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	182 ldr r9, =__iramtext_ram_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	183 ldr r10, =__iramtext_size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	184 1: ldmia r8!, {r0-r7}
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	185 stmia r9!, {r0-r7}
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	186 subs r10, r10, #0x20
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	187 bhi 1b
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	188 /* likewise copy .data from flash to XRAM */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	189 ldr r8, =__initdata_flash_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	190 ldr r9, =__initdata_ram_addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	191 ldr r10, =__initdata_size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	192 1: ldmia r8!, {r0-r7}
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	193 stmia r9!, {r0-r7}
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	194 subs r10, r10, #0x20
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	195 bhi 1b
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	196 #endif
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	197
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	198 /* Both flash and XRAM builds: zero .bss */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	199
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	200 ldr r0, =__intbss_start
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	201 ldr r1, =__intbss_size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	202 bl bzero
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	203 ldr r0, =__extbss_start
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	204 ldr r1, =__extbss_size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	205 bl bzero
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	206
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	207 @ TI's int.s code continues
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	208
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	209 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	210 @ Initialize the system stack pointers. This is done after the BSS is
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	211 @ cleared because the TCD_System_Stack pointer is a BSS variable! It is
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	212 @ assumed that the .cmd file is written to direct where these stacks should
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	213 @ be allocated and to align them on double word boundaries.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	214 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	215 LDR a1,StackSegment @ Pickup the begining address from .cmd file
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	216 @ (is aligned on 8 byte boundary)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	217 MOV a2,#SYSTEM_SIZE @ Pickup system stack size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	218 SUB a2,a2,#4 @ Subtract one word for first addr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	219 ADD a3,a1,a2 @ Build start of system stack area
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	220 MOV v7,a1 @ Setup initial stack limit
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	221 LDR a4,System_Limit @ Pickup system stack limit address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	222 STR v7,[a4, #0] @ Save stack limit
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	223 MOV sp,a3 @ Setup initial stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	224 LDR a4,System_Stack @ Pickup system stack address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	225 STR sp,[a4, #0] @ Save stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	226 MOV a2,#IRQ_STACK_SIZE @ Pickup IRQ stack size in bytes
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	227 ADD a3,a3,a2 @ Allocate IRQ stack area
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	228 MRS a1,CPSR @ Pickup current CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	229 BIC a1,a1,#MODE_MASK @ Clear the mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	230 ORR a1,a1,#IRQ_MODE @ Set the IRQ mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	231 MSR CPSR,a1 @ Move to IRQ mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	232 MOV sp,a3 @ Setup IRQ stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	233 MOV a2,#FIQ_STACK_SIZE @ Pickup FIQ stack size in bytes
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	234 ADD a3,a3,a2 @ Allocate FIQ stack area
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	235 MRS a1,CPSR @ Pickup current CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	236 BIC a1,a1,#MODE_MASK @ Clear the mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	237 ORR a1,a1,#FIQ_MODE @ Set the FIQ mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	238 MSR CPSR,a1 @ Move to the FIQ mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	239 MOV sp,a3 @ Setup FIQ stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	240
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	241 MRS a1,CPSR @ Pickup current CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	242 BIC a1,a1,#MODE_MASK @ Clear the mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	243 ORR a1,a1,#ABORT_MODE @ Set the Abort mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	244 MSR CPSR,a1 @ Move to the Abort mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	245 LDR sp,Exception_Stack @ Setup Abort stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	246
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	247 MRS a1,CPSR @ Pickup current CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	248 BIC a1,a1,#MODE_MASK @ Clear the mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	249 ORR a1,a1,#UNDEF_MODE @ Set the Undefined mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	250 MSR CPSR,a1 @ Move to the Undefined mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	251 LDR sp,Exception_Stack @ Setup Undefined stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	252 @ (should never be used)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	253
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	254 @ go to Supervisor Mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	255 MRS a1,CPSR @ Pickup current CPSR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	256 BIC a1,a1,#MODE_MASK @ Clear mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	257 ORR a1,a1,#SUP_MODE @ Set the supervisor mode bits
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	258 MSR CPSR,a1 @ All interrupt stacks are setup,
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	259 @ return to supervisor mode
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	260 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	261 @ /* Define the global data structures that need to be initialized by this
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	262 @ routine. These structures are used to define the system timer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	263 @ management HISR. */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	264 @ TMD_HISR_Stack_Ptr = (VOID *) a3;
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	265 @ TMD_HISR_Stack_Size = TIMER_SIZE;
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	266 @ TMD_HISR_Priority = TIMER_PRIORITY;
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	267 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	268 @ TMD_HISR_Stack_Ptr points at the top (the lowest address) of the allocated
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	269 @ area. The Timer HISR (called "SYSTEM H") and its related stack will be created
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	270 @ in TMI_Initialize(). The current stack pointer will be set at the bottom (the
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	271 @ lowest address) of the expected area.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	272
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	273 LDR a4,HISR_Stack_Ptr @ Pickup variable's address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	274 ADD a3,a3,#4 @ Increment to next available word
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	275 STR a3,[a4, #0] @ Setup timer HISR stack pointer
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	276 MOV a2,#TIMER_SIZE @ Pickup the timer HISR stack size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	277 BIC a2,a2,#3 @ Insure word alignment
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	278 ADD a3,a3,a2 @ Allocate the timer HISR stack
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	279 @ from available memory
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	280 LDR a4,HISR_Stack_Size @ Pickup variable's address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	281 STR a2,[a4, #0] @ Setup timer HISR stack size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	282 MOV a2,#TIMER_PRIORITY @ Pickup timer HISR priority (0-2)
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	283 LDR a4,HISR_Priority @ Pickup variable's address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	284 STR a2,[a4, #0] @ Setup timer HISR priority
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	285
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	286 /* TI's original code called f_load_int_mem() at this point */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	287 /* let's do our internal ROM enable step here */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	288
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	289 ldr r1, EXTRA_CONTROL_REG
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	290 ldrh r0, [r1, #0]
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	291 bic r0, #0x0300
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	292 orr r0, #0x0100
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	293 strh r0, [r1, #0]
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	294
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	295 @ We now fill up the System, IRQ, FIQ and System Timer HISR stacks with 0xFE for
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	296 @ checking the status of the stacks later.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	297 @ inputs:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	298 @ a3 still has the bottom of all four stacks and is aligned.
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	299 @ algorithm:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	300 @ We start from the top of all four stacks (*System_Limit), which is
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	301 @ necessarily aligned. We store 0xFEFEFEFE until we have filled the
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	302 @ bottom of the fourth stack
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	303 @ outputs:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	304 @ memory has 0xFE on all four stacks: System, FIQ, IRQ and System Timer HISR
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	305 @ a3 still has the bottom of all four stacks
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	306
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	307 LDR a2,System_Limit @ pickup system stack limit address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	308 LDR a1,[a2] @ a1 = StackSegment
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	309 LDR a4,=0xFEFEFEFE
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	310
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	311 fill_stack:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	312 STR a4,[a1],#4 @ store a word and increment by four
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	313 CMP a1,a3 @ is this the last address?
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	314 BLT fill_stack @ if not, loop back
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	315
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	316 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	317 @ /* Call INC_Initialize with a pointer to the first available memory
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	318 @ address after the compiler's global data. This memory may be used
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	319 @ by the application. */
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	320 @ INC_Initialize(first_available_memory);
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	321 @
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	322 MOV a1,a3 @ Pass the first available memory
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	323 B INC_Initialize @ to high-level initialization
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	324
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	325 @ literal pool from int.s
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	326
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	327 addrCS0: .word 0xfffffb00 @ CS0 address space
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	328
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	329 EX_MPU_CONF_REG: .word 0xFFFEF006 @ Extended MPU configuration register address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	330 EX_FLASH_VALUE: .short 0x0008 @ set bit to enable A22
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	331
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	332 CNTL_ARM_CLK_REG: .word 0xFFFFFD00 @ CNTL_ARM_CLK register address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	333 DPLL_CNTRL_REG: .word 0xFFFF9800 @ DPLL control register address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	334 EXTRA_CONTROL_REG: .word 0xFFFFFB10 @ Extra Control register CONF address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	335 MPU_CTL_REG: .word 0xFFFFFF08 @ MPU_CTL register address
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	336
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	337 CNTL_ARM_CLK_RST: .short 0x1081 @ Initialization of CNTL_ARM_CLK register
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	338 @ Use DPLL, Divide by 1
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	339 DPLL_CONTROL_RST: .short 0x2002 @ Configure DPLL in default state
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	340 DISABLE_DU_MASK: .short 0x0800 @ Mask to Disable the DU module
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	341 ENABLE_DU_MASK: .short 0xF7FF @ Mask to Enable the DU module
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	342 MPU_CTL_RST: .short 0x0000 @ Reset value of MPU_CTL register - All protections disabled
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	343
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	344 CS0_MEM_REG: .short 0x2a1 @ 1 Dummy Cycle 16 bit 1 WS SW BP enable
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	345 CS1_MEM_REG: .short 0x2a1 @ 1 Dummy Cycle 16 bit 1 WS SW BP enable
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	346 CS2_MEM_REG: .short 0x2a1 @ 1 Dummy Cycle 16 bit 1 WS SW BP enable
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	347 CS3_MEM_REG: .short 0x283 @ 1 Dummy Cycle 8 bit 3 WS SW BP enable
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	348 CS4_MEM_REG: .short 0xe85 @ default reset value
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	349 CS6_MEM_REG: .short 0x2c0 @ Internal RAM init : 0 WS, 32 bits, little, write enable
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	350 CS7_MEM_REG: .short 0x040 @ Internal BOOT ROM init : 0 WS, 32 bits, little, write disable
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	351 CTL_MEM_REG: .short 0x02a @ rhea strobe 0/1 + API access size adaptation
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	352
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	353 StackSegment:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	354 .word _Stack_segment_start
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	355
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	356 System_Limit:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	357 .word TCT_System_Limit
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	358
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	359 System_Stack:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	360 .word TCD_System_Stack
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	361
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	362 HISR_Stack_Ptr:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	363 .word TMD_HISR_Stack_Ptr
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	364
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	365 HISR_Stack_Size:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	366 .word TMD_HISR_Stack_Size
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	367
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	368 HISR_Priority:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	369 .word TMD_HISR_Priority
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	370
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	371 Exception_Stack:
b398f288d20a src/cs/system/main/gcc/bootentry.S: written Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	372 .word _Except_Stack_SP

89

b398f288d20a src/cs/system/main/gcc/bootentry.S: written