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Prepare for higher half - map entire lower 4 GB

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This commit is contained in:
Jeremy Soller 2016-08-18 07:56:47 -06:00
parent 8ddddcec9f
commit 0693540a5b
4 changed files with 28 additions and 15 deletions
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26
bootloader/x86/kernel.ld
View file

@ -1,31 +1,38 @@
ENTRY(kstart)
OUTPUT_FORMAT(elf64-x86-64)
KERNEL_OFFSET = 0;
SECTIONS {
kernel_base = 0x101000;
. = kernel_base;
. = 0x100000;
.text : AT(ADDR(.text) - kernel_base) {
. += SIZEOF_HEADERS;
. = ALIGN(4096);
. += KERNEL_OFFSET;
.text : AT(ADDR(.text) - KERNEL_OFFSET) {
__text_start = .;
*(.text*)
. = ALIGN(4096);
__text_end = .;
}
.rodata : AT(ADDR(.rodata) - kernel_base) {
.rodata : AT(ADDR(.rodata) - KERNEL_OFFSET) {
__rodata_start = .;
*(.rodata*)
. = ALIGN(4096);
__rodata_end = .;
}
.data : AT(ADDR(.data) - kernel_base) {
.data : AT(ADDR(.data) - KERNEL_OFFSET) {
__data_start = .;
*(.data*)
. = ALIGN(4096);
__data_end = .;
}
.bss : AT(ADDR(.bss) - kernel_base) {
.bss : AT(ADDR(.bss) - KERNEL_OFFSET) {
__bss_start = .;
*(.bss*)
. = ALIGN(4096);
@ -33,8 +40,9 @@ SECTIONS {
}
/DISCARD/ : {
*(.comment)
*(.eh_frame)
*(.rel.eh_frame)
*(.comment*)
*(.eh_frame*)
*(.note*)
*(.rel.eh_frame*)
}
}

11
bootloader/x86/startup-x86_64.asm
View file

@ -53,7 +53,7 @@ startup_arch:
xor edi, edi
xor eax, eax
mov ecx, 3 * 4096 / 4 ;PML4, PDP, PD / moves 4 Bytes at once
mov ecx, 6 * 4096 / 4 ;PML4, PDP, 4 PD / moves 4 Bytes at once
cld
rep stosd
@ -63,12 +63,15 @@ startup_arch:
add edi, 0x1000
;Link last PML4 to PML4
mov DWORD [es:edi - 8], 0x70000 | 1 << 1 | 1
;Link first PDP to PD
;Link first four PDP to PD
mov DWORD [es:edi], 0x72000 | 1 << 1 | 1
mov DWORD [es:edi + 8], 0x73000 | 1 << 1 | 1
mov DWORD [es:edi + 16], 0x74000 | 1 << 1 | 1
mov DWORD [es:edi + 24], 0x75000 | 1 << 1 | 1
add edi, 0x1000
;Link all PD's (512 per PDP, 2MB each)y
mov ebx, 1 << 7 | 1 << 1 | 1
mov ecx, 512
mov ecx, 4*512
.setpd:
mov [es:edi], ebx
add ebx, 0x200000
@ -100,6 +103,8 @@ startup_arch:
or ebx, 1 << 31 | 1 << 16 | 1 ;Bit 31: Paging, Bit 16: write protect kernel, Bit 0: Protected Mode
mov cr0, ebx
xchg bx, bx
; far jump to enable Long Mode and load CS with 64 bit segment
jmp gdt.kernel_code:long_mode