diff options
Diffstat (limited to 'stage3')
| -rw-r--r-- | stage3/main.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/stage3/main.c b/stage3/main.c index ac915ff..a7212b9 100644 --- a/stage3/main.c +++ b/stage3/main.c @@ -110,6 +110,33 @@ void kmain() print_hex((u64) gfx_info->framebuffer + gfx_info->pitch * gfx_info->height); print(S("\n")); + u32 vendor[4]; + asm volatile("cpuid":"=a"(vendor[0]),"=b"(vendor[1]), + "=c"(vendor[3]),"=d"(vendor[2]):"a"(0)); + + print(S("cpu vendor: ")); + print((str) { 12, (void *) &vendor[1] }); + print(S("\n")); + + u32 features; + asm volatile("cpuid":"=d"(features):"a"(1):"ebx","ecx"); + + print(S("cpu features: ")); + print_num_pad(features, 2, 32, '0'); + print(S("\n")); + + // enable SSE. long mode demands it is present + u64 cr0; + asm volatile("mov %%cr0, %0 \n":"=r"(cr0)); + asm volatile("mov %0, %%cr0"::"r"((cr0 & ~(1 << 2)) | (1 << 1))); + + u64 cr4; + asm volatile("mov %%cr4, %0":"=r"(cr4)); + asm volatile("mov %0, %%cr4"::"r"(cr4 | (1 << 9) | (1 << 10))); + + u16 fpu_cw = 0x37a; + asm volatile("fldcw %0"::"m"(fpu_cw)); + interrupts_init(); pic_init(); thread_init(); @@ -117,7 +144,7 @@ void kmain() ata_init(); ps2_init(); - print(S("loading debug info\n")); + print(S("loading kernel debug info...\n")); dbg_map = fs_read(S("dbg/kernel.map")); dbg_disas = fs_read(S("dbg/kernel.dis.asm")); |