FreeCalypso > hg > fc-tourmaline
annotate src/cs/system/main/gcc/irqfiq.S @ 303:f76436d19a7a default tip
!GPRS config: fix long-standing AT+COPS chance hanging bug
There has been a long-standing bug in FreeCalypso going back years:
sometimes in the AT command bring-up sequence of an ACI-only MS,
the AT+COPS command would produce only a power scan followed by
cessation of protocol stack activity (only L1 ADC traces), instead
of the expected network search sequence. This behaviour was seen
in different FC firmware versions going back to Citrine, and seemed
to follow some law of chance, not reliably repeatable.
This bug has been tracked down and found to be specific to !GPRS
configuration, stemming from our TCS2/TCS3 hybrid and reconstruction
of !GPRS support that was bitrotten in TCS3.2/LoCosto version.
ACI module psa_mms.c, needed only for !GPRS, was missing in the TCS3
version and had to be pulled from TCS2 - but as it turns out,
there is a new field in the MMR_REG_REQ primitive that needs to be
set correctly, and that psa_mms.c module is the place where this
initialization needed to be added.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 08 Jun 2023 08:23:37 +0000 |
parents | 4e78acac3d88 |
children |
rev | line source |
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0
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 /* |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 * This module contains the assembly shells for IRQ and FIQ, separated |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 * from the architectured vectors only by some simple unconditional |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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4 * branch instructions. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 * |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 * Note that TI's way of handling interrupts sacrifices Nucleus' ability |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 * to nest interrupts and minimize the IRQ-disabled window: if my (Falcon's) |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 * understanding is correct, TI's code leaves all further IRQs disabled |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 * for the full execution duration of an IRQ handler. (IRQ handlers are |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 * really LISRs, but TI's GSM fw does not use Nucleus' LISR framework.) |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 */ |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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13 .text |
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src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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14 .code 32 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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15 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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parents:
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16 .globl _INT_IRQ |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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17 _INT_IRQ: |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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18 STMDB sp!,{r0-r4} @ used to be a1-a4 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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19 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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20 /* |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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21 * Thanks to TI for discovering and documenting this apparent ARM7TDMI bug: |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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22 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 BUG correction 1st part ------------------- |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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24 It looks like there is an issue with ARM7 IRQ masking in the CPSR register |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 which leads to crashes in Nucleus+ scheduler. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 Basically the code below (correct as LOCKOUT = 0xC0) is used in many places by N+ but do not |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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27 prevent from having an interrupt after the execution of the third line (I mean execution, not |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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28 fetch). |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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29 MRS a1,CPSR ; Pickup current CPSR |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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30 ORR a1,a1,#LOCKOUT ; Build interrupt lockout value |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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31 MSR CPSR,a1 ; Lockout interrupts |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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32 * IRQ INTERRUPT ! * |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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33 Next instructions... |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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34 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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35 SW workaround: |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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36 When a task is interrupted at this point an interrupted context is stored on its task and will |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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37 be resumed later on at the next instruction but to make a long story short it leads to some |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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38 problem as the OS does not expect to be interrupted there. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 Further testing tends to show that the CPSR *seems* to be loaded with the proper masking value |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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40 but that the IRQ is still triggered (has been hardwarewise requested during the instruction |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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41 exectution by the ARM7 core?) |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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42 */ |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
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43 |
4e78acac3d88
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44 MRS a1,spsr @ check for the IRQ bug: |
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src/{condat,cs,gpf,nucleus}: import from Selenite
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45 TST a1,#0x80 @ if the I - flag is set, |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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46 BNE IRQBUG @ then postpone execution of this IRQ |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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47 /* Bug correction 1st part end --------------- */ |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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48 |
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src/{condat,cs,gpf,nucleus}: import from Selenite
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49 SUB r4,lr,#4 @ Save IRQ's lr (return address) |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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50 BL TCT_Interrupt_Context_Save @ Call context save routine |
4e78acac3d88
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51 |
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src/{condat,cs,gpf,nucleus}: import from Selenite
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52 BL IQ_IRQ_isr @ Call int. service routine |
4e78acac3d88
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53 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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54 /* IRQ interrupt processing is complete. Restore context- Never |
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55 returns! */ |
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56 B TCT_Interrupt_Context_Restore |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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57 |
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58 /* BUG correction 2nd part ------------------ */ |
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59 IRQBUG: LDMFD sp!,{r0-r4} @ return from interrupt |
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60 SUBS pc,r14,#4 |
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61 /* BUG correction 2nd part end -------------- */ |
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62 |
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63 .globl _INT_FIQ |
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64 _INT_FIQ: |
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65 STMDB sp!,{r0-r4} @ used to be a1-a4 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
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66 SUB r4,lr,#4 @ Save FIQ's lr (return address) |
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src/{condat,cs,gpf,nucleus}: import from Selenite
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67 BL TCT_Interrupt_Context_Save @ Call context save routine |
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68 |
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69 BL IQ_FIQ_isr @ Call the FIQ ISR |
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70 |
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71 /* FIQ interrupt processing is complete. Restore context- Never |
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72 returns! */ |
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73 B TCT_Interrupt_Context_Restore |