OK6410A 开发板 (八) 60 linux-5.11 OK6410A 异常相关初始化

arch/arm/kernel/head.S

77 ENTRY(stext)

arch/arm/kernel/traps.c

devicemaps_init

void * vectors = early_alloc(PAGE_SIZE * 2);

early_trap_init(vectors); 

vectors_base = vectors;

vectors_page = vectors;

// 填充 vectors - vectors+0x1000-1

vectors_base)[i] = 0xe7fddef1;

memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);

// 填充 vectors+0x1000 - vectors+0x2000-1

memcpy((void *)vectors + 0x1000, __stubs_start, __stubs_end - __stubs_start);

kuser_init(vectors_base);

int kuser_sz = __kuser_helper_end - __kuser_helper_start;

// 覆盖 vectors+0x1000-kuser_sz - vectors+0x1000-1

memcpy(vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);

// 覆盖 vectors+0xfe0 -  vectors+0xfe4-1

if (tls_emu || has_tls_reg) memcpy(vectors + 0xfe0, vectors + 0xfe8, 4);

flush_icache_range(vectors, vectors + PAGE_SIZE * 2);

...

map.pfn = __phys_to_pfn(virt_to_phys(vectors));

map.virtual = 0xffff0000;

map.length = PAGE_SIZE;

map.type = MT_HIGH_VECTORS;

create_mapping(&map);

map.pfn += 1;

map.virtual = 0xffff0000 + PAGE_SIZE;

map.length = PAGE_SIZE;

map.type = MT_LOW_VECTORS;

create_mapping(&map);