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for ITLB misses, map following page also since sometimes (prefetch?) the

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fault PC reported by the access error exceptions seems to be off a few
instructions.
This commit is contained in:
Markus Fröschle
2014-09-28 16:44:39 +00:00
parent c0abafa805
commit a7813d2d91
1 changed files with 4 additions and 1 deletions
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5
Bas_gcc_mmu/sys/mmu.c
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@@ -63,7 +63,7 @@
#error "unknown machine!" #error "unknown machine!"
#endif /* MACHINE_FIREBEE */ #endif /* MACHINE_FIREBEE */
#define DBG_MMU //#define DBG_MMU
#ifdef DBG_MMU #ifdef DBG_MMU
#define dbg(format, arg...) do { xprintf("DEBUG (%s()): " format, __FUNCTION__, ##arg);} while(0) #define dbg(format, arg...) do { xprintf("DEBUG (%s()): " format, __FUNCTION__, ##arg);} while(0)
#else #else
@@ -686,6 +686,9 @@ uint32_t mmutr_miss(uint32_t mmu_sr, uint32_t fault_address, uint32_t pc,
fault_address, format_status, mmu_sr, pc); fault_address, format_status, mmu_sr, pc);
dbg("fault = 0x%08x\r\n", fault); dbg("fault = 0x%08x\r\n", fault);
mmu_map_8k_instruction_page(pc, 0); mmu_map_8k_instruction_page(pc, 0);
/* due to prefetch, it makes sense to map the next adjacent page also for ITLBs */
mmu_map_8k_instruction_page(pc + DEFAULT_PAGE_SIZE, 0);
break; break;
case 0x08020000: /* TLB miss on data write */ case 0x08020000: /* TLB miss on data write */