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max 🍓
2022-12-14 18:31:27 +00:00
parent 268c063876
commit a94dfdc952
2 changed files with 14 additions and 14 deletions
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24
arch/x86_64/start_32.S
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@@ -51,7 +51,7 @@ bootstrap_gdt_ptr:
LONG MODE BOOTSTRAP PAGING STRUCTURES
*******/
.section .boot.bss, "aw", @nobits
bootstrap_pml4t: # a single PML4T
bootstrap_pml4t: # a single PML4T
.skip 0x1000
bootstrap_pdpt: # a single PDPT
.skip 0x1000
@@ -197,7 +197,7 @@ init_page_tables:
add $0x1000, %edi
sub %ecx, %edi
sub $0x08, %edi # subtract one from the index here, otherwise the mapping will be at 0xffffffffc0000000
# (each entry in the array is 8 bytes long)
# (each entry in the array is 8 bytes long)
/* %ESI is a pointer into the pagedir buffer.
%EDI is a pointer into the PDPT.
@@ -290,17 +290,17 @@ long_mode_switch:
_start:
mov $bootstrap_stack_top, %esp
push %ebx # store the pointer to the multiboot info block.
push %ebx # store the pointer to the multiboot info block.
# check if long mode is supported
movl $0x80000000, %eax # Extended-function 80000000h.
cpuid # Is largest extended function
cmpl $0x80000000, %eax # any function > 80000000h?
jbe no_long_mode # If not, no long mode.
movl $0x80000001, %eax # Extended-function 80000001h.
cpuid # Now EDX = extended-features flags.
btl $29, %edx # Test if long mode is supported.
jnc no_long_mode # Exit if not supported.
movl $0x80000000, %eax # Extended-function 80000000h.
cpuid # Is largest extended function
cmpl $0x80000000, %eax # any function > 80000000h?
jbe no_long_mode # If not, no long mode.
movl $0x80000001, %eax # Extended-function 80000001h.
cpuid # Now EDX = extended-features flags.
btl $29, %edx # Test if long mode is supported.
jnc no_long_mode # Exit if not supported.
movl $1, %eax
cpuid
@@ -312,7 +312,7 @@ _start:
movb $0xF, (%eax)
call init_page_tables
call long_mode_switch # calls start_64, does not return
call long_mode_switch # calls start_64, does not return
cli
hlt