diff --git a/x86/kernel.ld b/x86/kernel.ld index 19f0f2c0f2f794b9fa2c5fc7baac7c135907df6b..09d99583bb92b480339bc775f7e2a225ef28fd39 100644 --- a/x86/kernel.ld +++ b/x86/kernel.ld @@ -1,31 +1,38 @@ ENTRY(kstart) +OUTPUT_FORMAT(elf64-x86-64) + +KERNEL_OFFSET = 0; SECTIONS { - kernel_base = 0x101000; - . = kernel_base; + . = 0x100000; + + . += SIZEOF_HEADERS; + . = ALIGN(4096); + + . += KERNEL_OFFSET; - .text : AT(ADDR(.text) - kernel_base) { + .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*) } } diff --git a/x86/startup-x86_64.asm b/x86/startup-x86_64.asm index 1e4c57a2b74dcb6fa8da388d5e8ad2ac19bc9150..bd5a6db1f53d8ce394cf20744d31e3cadbcca48c 100644 --- a/x86/startup-x86_64.asm +++ b/x86/startup-x86_64.asm @@ -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