feat: setup bitmap for physical allocator
This commit is contained in:
parent
da0a8f4e1b
commit
459a4b0b2a
3
.gitignore
vendored
3
.gitignore
vendored
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@ -3,6 +3,7 @@
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*.bin
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*.iso
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*~
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\#*\#
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*.elf
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*.a
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@ -11,3 +12,5 @@ vmstupid
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/sysroot
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log.txt
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@ -5,7 +5,7 @@
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[Website](https://stupidos.d0p1.eu)
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[](https://github.com/sponsors/d0p1s4m4?style=flat-square)
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[](https://github.com/sponsors/d0p1s4m4)
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</div>
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@ -68,6 +68,7 @@ entry:
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jmp hang
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.mem_ok:
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LOG msg_pmm_initialized
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extern setup_paging
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call setup_paging
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@ -81,6 +82,7 @@ section .rodata
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msg_hello_world db "StupidOS v", STUPID_VERSION, " (built with ", NASM_VERSION, " on ", BUILD_DATE, ")", 0
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msg_boot_info db "Bootloader: %s", 0
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msg_pmm_initialized db "PMM initialized", 0
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err_invalid_boot_magic db "[ERROR] Invalid boot magic (got: %x, expected: 0x2BADB002)", 0
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err_cannot_map_memory db "[ERROR] Can't map memory", 0
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@ -4,6 +4,7 @@ global setup_idt
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setup_idt:
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%assign i 0
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%rep 32
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;; TODO: refactor
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extern isr %+ i
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mov eax, isr %+ i
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; offset (low)
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@ -26,3 +26,5 @@ SECTIONS
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kernel_end = .;
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}
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kernel_size = kernel_end - kernel_start;
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343
kernel/pmm.s
343
kernel/pmm.s
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@ -1,9 +1,280 @@
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[BITS 32]
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;; XXX: align address to page
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%include "base.inc"
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%include "multiboot.inc"
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extern kernel_size
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extern kernel_end
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struc bitmap
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.length: resd 1
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.addr: resd 1
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endstruc
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section .text
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bitmap_count_free_page:
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push ebp
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mov ebp, esp
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push edi
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push esi
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push ebx
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mov edi, [bitmap_info + bitmap.addr]
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xor ebx, ebx
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.loop:
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inc edi
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inc ebx
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cmp ebx, [bitmap_info]
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jb .loop
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.end:
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pop ebx
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pop esi
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pop edi
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leave
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ret
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bitmap_mark:
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push ebp
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mov ebp, esp
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push edi
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push esi
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mov edi, 1
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mov eax, [ebp + 8]
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and eax, 0x7 ; eax % 8
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mov ecx, eax
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shl edi, cl
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mov eax, [ebp + 8]
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shr eax, 0x3 ; eax / 8
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mov esi, [bitmap_info + bitmap.addr]
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add esi, eax
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mov dl, byte [esi]
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mov ecx, [ebp + 12]
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test ecx, ecx
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jz .clear
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or edx, edi ; set bit
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jmp .end
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.clear:
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not edi
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and edx, edi ; clear bit
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.end:
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mov byte [esi], dl
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pop esi
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pop edi
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leave
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ret
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init_bitmap:
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push ebp
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mov ebp, esp
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push edi
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mov ecx, [bitmap_info]
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mov al, 0xFF
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mov edi, [bitmap_info + bitmap.addr]
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rep stosb
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pop edi
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leave
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ret
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bitmap_mark_range_free:
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push ebp
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mov ebp, esp
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push edi
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push esi
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push ebx
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mov edi, [ebp + 8] ; start address
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mov esi, [ebp + 12] ; length
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xor ebx, ebx ; counter (I know I SHOUD use 'ecx' as counter
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; but since the ABI state it's not preserved
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; accross function call)
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push dword 0 ; bitmap_mark(addr, 0) == clear
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.loop:
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cmp ebx, esi
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jnb .end_loop
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add edi, ebx
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jc .end_loop ; exit on overflow
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push edi
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call bitmap_mark
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add esp, 4
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add ebx, 0x1000 ; add page size
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jmp .loop
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.end_loop:
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add esp, 4
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pop ebx
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pop esi
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pop edi
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leave
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ret
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setup_pmm_mmap:
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push ebp
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mov ebp, esp
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sub esp, 4
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push edi
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push esi
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push ebx
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mov edi, [ebp + 8] ; mb_mmap struct addr
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mov esi, [ebp + 12] ; mmap length
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xor ebx, ebx ; pass
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mov [ebp - 4], ebx ; set max addr to 0
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.loop:
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;; TODO: PAE stuff
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;; skip address > 32bit
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mov eax, [edi + mb_mmap.addr + 4]
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and eax, eax
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jnz .next
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mov eax, [edi + mb_mmap.length + 4]
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and eax, eax
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jnz .next
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;; check if first pass
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and ebx, ebx
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jz .first_pass
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mov eax, [edi + mb_mmap.type]
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and eax, 0x1 ; check if free
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jz .next
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;;
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mov eax, [bitmap_info]
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mov ecx, [mb_mmap.length]
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cmp eax, ecx
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ja .next
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cmp ebx, 0x1
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jne .third_pass
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mov eax, [edi + mb_mmap.addr]
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mov [bitmap_info + bitmap.addr], eax
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LOG msg_bitmap_stored_at, eax
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call init_bitmap ; mark all memory as used
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jmp .bitmap_size_already_set
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;; TODO: mark as free in bitmap
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.third_pass:
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push dword [edi + mb_mmap.addr]
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push dword [edi + mb_mmap.length]
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call bitmap_mark_range_free
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add esp, 8
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jmp .next
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;; first pass then calculate higher address
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.first_pass:
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LOG msg_mmap_entry, dword [edi + mb_mmap.addr + 4], \
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dword [edi + mb_mmap.addr], \
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dword [edi + mb_mmap.length + 4], \
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dword [edi + mb_mmap.length], \
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dword [edi + mb_mmap.type]
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mov eax, [edi + mb_mmap.length]
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add eax, [edi + mb_mmap.addr]
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jnc .no_overflow
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mov eax, -1 ; if overflow set eax to (uint32_t)-1
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.no_overflow:
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mov edx, [ebp - 4]
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cmp edx, eax
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ja .next
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mov [ebp - 4], eax
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.next:
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mov eax, [edi + mb_mmap.size]
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add eax, 0x4
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add edi, eax ; jump to next entry
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sub esi, eax
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jnz .loop
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and ebx, ebx
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jnz .bitmap_size_already_set
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LOG msg_max_mem, dword [ebp - 4]
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mov eax, [ebp - 4]
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shr eax, 15 ; eax / (4096*8)
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mov [bitmap_info], eax
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.bitmap_size_already_set:
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inc ebx
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cmp ebx, 2
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jbe .loop
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pop ebx
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pop esi
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pop edi
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leave
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ret
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setup_pmm_legacy:
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push ebp
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mov ebp, esp
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push edi
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push esi
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push ebx
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xor eax, eax
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mov ecx, [ebp + 8]
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shl ecx, 0xA ; ecx * 1KiB
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mov esi, ecx
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LOG msg_mem_block, eax, ecx
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mov eax, 0x100000
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mov ecx, [ebp + 12]
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shl ecx, 0xA ; ecx * 1KiB
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mov ebx, ecx
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mov edi, eax
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add edi, ecx
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LOG msg_mem_block, eax, ecx
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LOG msg_max_mem, edi
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shr edi, 15 ; (edi / (4046*8))
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mov dword [bitmap_info], edi
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cmp edi, esi
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ja .try_high
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mov dword [bitmap_info + bitmap.addr], 0
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jmp .initialize_bitmap
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.try_high:
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mov eax, ebx
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sub ebx, kernel_size
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cmp edi, ebx
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ja .err_no_mem
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mov dword [bitmap_info + bitmap.addr], kernel_end
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.initialize_bitmap:
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call init_bitmap
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push esi
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push dword 0
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call bitmap_mark_range_free
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push ebx
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push dword 0x100000
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call bitmap_mark_range_free
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xor eax, eax
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jmp .end
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.err_no_mem:
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mov eax, 1
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.end:
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pop ebx
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pop esi
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pop edi
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leave
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ret
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global setup_pmm
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setup_pmm:
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push ebp
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@ -17,20 +288,11 @@ setup_pmm:
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mov eax, [edi]
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and eax, 0x40 ; (1 << 6)
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jz .no_mmap
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mov esi, [edi + mb_info.mmap_length]
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mov ebx, [edi + mb_info.mmap_addr]
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.loop:
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mov eax, ebx
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LOG msg_mmap_entry, dword [eax + mb_mmap.addr + 4], \
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dword [eax + mb_mmap.addr], \
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dword [eax + mb_mmap.length + 4], \
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dword [eax + mb_mmap.length], \
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dword [eax + mb_mmap.type]
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mov eax, [ebx + mb_mmap.size]
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add eax, 0x4
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add ebx, eax
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sub esi, eax
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jnz .loop
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push dword [edi + mb_info.mmap_length]
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push dword [edi + mb_info.mmap_addr]
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call setup_pmm_mmap
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add esp, 8
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jmp .end_mem_detection
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@ -40,16 +302,30 @@ setup_pmm:
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and eax, 0x1
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jz .err
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xor eax, eax
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mov ecx, [edi + mb_info.mem_lower]
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shl ecx, 0xA ; ecx * 1KiB
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LOG msg_mem_block, eax, ecx
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mov eax, 0x100000
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mov ecx, [edi + mb_info.mem_upper]
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shl ecx, 0xA
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LOG msg_mem_block, eax, ecx
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push dword [edi + mb_info.mem_upper]
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push dword [edi + mb_info.mem_lower]
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call setup_pmm_legacy
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add esp, 8
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.end_mem_detection:
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;; mark bitmap as used
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xor ebx, ebx
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mov edi, [bitmap_info + bitmap.addr]
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mov esi, [bitmap_info]
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push dword 1 ; bitmap_mark(addr, 1) == set
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.loop:
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cmp ebx, edi
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jnb .end_loop
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add edi, ebx
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push edi
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call bitmap_mark
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add esp, 4
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add ebx, 0x1000
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jmp .loop
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.end_loop:
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add esp, 4 ; previous "push dword 0"
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xor eax, eax
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jmp .end
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@ -62,6 +338,27 @@ setup_pmm:
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leave
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ret
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global alloc_frame
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alloc_frame:
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push esp
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mov ebp, esp
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leave
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ret
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global free_frame
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free_frame:
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push esp
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mov ebp, esp
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leave
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ret
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section .data
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bitmap_info:
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dd 0 ; size
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dd 0 ; ptr
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section .rodata
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warn_no_mmap db "[WARN] mmap flag not set", 0
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msg_mmap_entry db "Memory Map Entry:", 0xA
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@ -71,4 +368,6 @@ msg_mmap_entry db "Memory Map Entry:", 0xA
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msg_mem_block db "Free Memory:", 0xA
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db 0x9, "Address: %x", 0xA
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db 0x9, "Length: %x", 0
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msg_max_mem db "Max memory: %x", 0
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msg_bitmap_stored_at db "Bitmap stored at: %x", 0
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file db __FILE__, 0
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11
kernel/syscall.s
Normal file
11
kernel/syscall.s
Normal file
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@ -0,0 +1,11 @@
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[BITS 32]
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global syscall_table
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syscall_table:
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dd 0 ; sys_exit
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dd 0 ; sys_fork
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dd 0 ; sys_read
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dd 0 ; sys_write
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dd 0 ; sys_open
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dd 0 ; sys_close
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.end:
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