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view src/gpf/osl/os_drv.c @ 268:f2e52cab0a73

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abb_inth.c: check all interrupt causes, not just one The original code used if - else if - else if etc constructs, thus the first detected interrupt was the only one handled. However, Iota ITSTATREG is a clear-on-read register, thus if we only handle the first detected interrupt and skip checking the others, then the other interrupts will be lost, if more than one interrupt happened to occur in one ABB interrupt handling cycle - a form of rare race condition. Change the code to check all interrupts that were read in this cycle.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 13 Jun 2021 18:17:53 +0000
parents 4e78acac3d88
children
line wrap: on
line source

/*
 * This C module is a reconstruction based on the disassembly of
 * os_drv.obj in frame_na7_db_fl.lib from the Leonardo package.
 */

/* set of included headers from COFF symtab: */
#include "nucleus.h"
#include "typedefs.h"
#include "gdi.h"
#include "os.h"

typedef unsigned char u_char;

extern OS_HANDLE os_ext_pool_handle;

static u_char *HISR_Stack;
static T_DRV_SIGNAL *SignalID;
static void (*DrvCallback)(T_DRV_SIGNAL *);
static NU_HISR CallBack_HISR;

#define	CB_HISR_STACK_SIZE	1024

GLOBAL LONG
os_ExecuteCallback(OS_HANDLE Caller, void (*Callback)(T_DRV_SIGNAL *),
			T_DRV_SIGNAL *Signal)
{
	DrvCallback = Callback;
	SignalID = Signal;
	NU_Activate_HISR(&CallBack_HISR);
	return(OS_OK);
}

static void
CallbackFunc(void)
{
	DrvCallback(SignalID);
}

GLOBAL LONG
os_CreateCallback(void)
{
	if (os_AllocateMemory(OS_NOTASK, (T_VOID_STRUCT **) &HISR_Stack,
				CB_HISR_STACK_SIZE, 0xFFFFFFFF,
				os_ext_pool_handle) == OS_ERROR)
		return(OS_ERROR);
	if (NU_Create_HISR(&CallBack_HISR, "CB_HISR", CallbackFunc, 2,
				HISR_Stack, CB_HISR_STACK_SIZE) == NU_SUCCESS)
		return(OS_OK);
	else
		return(OS_ERROR);
}