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RISCOS: Use OS_SynchroniseCodeAreas to flush the cache

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Cameron Cawley 2022-06-15 00:19:48 +01:00 • committed by Le Philousophe
parent 02808a019a
commit f9e64f2293
1 changed files with 5 additions and 23 deletions
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28
backends/plugins/riscos/riscos-provider.cpp
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@ -32,34 +32,16 @@
#include <kernel.h>
#include <swis.h>
typedef void (*Cache_CleanInvalidateRangePtr)(void *start, void *end);
// This function enters in supervisor mode, call the ARMop and leaves the supervisor mode
static void call_Cache_CleanInvalidateRange(void *start, void *end, Cache_CleanInvalidateRangePtr f) __asm__(".call_Cache_CleanInvalidateRange");
__asm__(
".call_Cache_CleanInvalidateRange:\n"
"PUSH {r4, lr}\n" // Backup r4 and lr
"MRS r4, cpsr\n" // Backup CPSR in R4
"SWI 0x16\n" // OS_EnterOS
"MOV lr, pc\n" //
"MOV pc, r2\n" // Call 3rd argument (function pointer)
"MSR cpsr_c, r4\n" // Restore CPSR (leave SVC mode)
"POP {r4, pc}\n" // Restore R4 and return
);
class RiscOSDLObject : public ARMDLObject {
protected:
void flushDataCache(void *ptr, uint32 len) const override {
Cache_CleanInvalidateRangePtr Cache_CleanInvalidateRange;
_kernel_swi_regs regs;
if (!_swix(OS_MMUControl, _IN(0)|_OUT(0), 2 | 21 << 8, &Cache_CleanInvalidateRange)) {
call_Cache_CleanInvalidateRange(ptr, (char *)ptr + len, Cache_CleanInvalidateRange);
return;
}
regs.r[0] = 1;
regs.r[1] = (int)ptr;
regs.r[2] = (int)ptr + len;
// OS_MMUControl 2 or Cache_CleanInvalidateRange are not supported: fallback to old inefficient OS_MMUControl 1
_swix(OS_MMUControl, _IN(0), 1 | 1 << 28 | 1 << 30 | 1 << 31);
_kernel_swi(OS_SynchroniseCodeAreas, &regs, &regs);
}
};