use huge pages

1 files changed, 0 insertions, 343 deletions

diff --git a/stage3/paging.asm b/stage3/paging.asm
deleted file mode 100644
index f58bb98..0000000
--- a/stage3/paging.asm
+++ /dev/null
@@ -1,343 +0,0 @@
-global page_region
-%define PAGEBUFSIZE 0x10 * 0x1000
-
-section .bss
-
-ALIGN(4096)
-pagebuf_data: resb PAGEBUFSIZE
-
-section .data
-
-pagebuf_init:
-	.start: dq pagebuf_data
-	.size: dq PAGEBUFSIZE
-	.used: dq 0
-
-pagebuf: dq pagebuf_init
-
-next_page: dq 0
-
-section .text
-
-; allocate new page table buffer
-alloc:
-	; rsi = buffer (result)
-	; rdi = next_page
-	; r8  = pagebuf
-	; rbx = upper
-	; rax = tmp; used_next
-
-	mov r8, [pagebuf] ; *pagebuf
-	mov rsi, [r8]     ; start = pagebuf->start
-
-	mov rbx, [r8+8]   ; size = pagebuf->size
-	add rbx, rsi      ; upper_have = start + size
-
-	; round *up* to 0x1000 align
-	mov rax, 0xfff
-	add rsi, rax
-	not rax
-	and rsi, rax      ; aligned_start = (start + 0xfff) & (~0xfff)
-
-	mov rax, [r8+16]  ; used = pagebuf->used
-	add rax, 0x1000
-	add rsi, rax      ; upper_need = aligned_start + used + 0x1000
-
-	cmp rsi, rbx      ; if upper_need > upper_have
-	ja .newbuf        ; current region is full, get new
-
-	cmp rsi, r10      ; if upper_need >= next_page
-	jae .oom          ; out of memory (target buffer isn't paged yet)
-
-	mov [r8+16], rax  ; pagebuf->used = used + 0x1000
-
-	; clear out buffer
-
-	mov rbx, rsi
-	sub rsi, 0x1000
-
-.clear:
-	sub rbx, 8
-	mov qword[rbx], 0
-	cmp rbx, rsi
-	jne .clear
-
-	ret
-
-; select next page buffer
-.newbuf:
-	cmp r8, pagebuf_init
-	jne .nextbuf
-
-	mov r8, 0x500
-	jmp .trybuf
-
-.nextbuf:
-	add r8, 24
-
-.trybuf:
-	cmp qword[r8], 0
-	je .oom       ; last region reached
-
-	mov rax, [r8+16]
-
-	cmp rax, -1
-	je .nextbuf   ; region is reserved
-
-	cmp rax, 0
-	jne .oom      ; region has not been paged yet
-
-	mov [pagebuf], r8
-	jmp alloc
-
-.oom:
-	push rdi
-
-	mov rdi, .oom_msg
-	; call print_str
-
-	pop rdi
-
-	; call print_hex
-	; call newline
-
-	jmp $
-
-.oom_msg: db "out of memory for page table", 10, "next_page = ", 0
-
-; get/create page tables
-get_tables:
-; level 4
-
-	; rdi = address         (arg, persist)
-	; rax = tmp
-	; rbx = mask
-	; rcx = bits            (persist)
-	; rdx = level           (persist)
-	; r8  = table address
-	; rsi = next offset     (persist)
-
-	mov cl, 12+9*4
-	mov dl, 4
-
-	mov rsi, 0x1000
-
-; level 4
-.level:
-	dec dl
-	mov r8, rdi
-	mov rbx, -1           ; reset remainder mask
-	shl rbx, cl           ; update remainder mask
-	not rbx               ; negate remainder mask
-	and r8, rbx           ; apply remainder mask
-
-	mov al, 9
-	mul dl
-	add al, 12
-	mov cl, al
-
-	shr r8, cl            ; divide
-	shl r8, 3             ; multiply by 8
-
-	mov rbx, 0xfff        ; 0x1000 alignment
-	not rbx               ; offset mask
-
-	and rsi, rbx          ; apply offset mask
-	add r8, rsi           ; add offset
-	push r8               ; store
-
-	cmp dl, 0
-	je .done
-
-	mov rsi, [r8]         ; next offset
-	cmp rsi, 0
-	jne .level
-
-	call alloc
-	or rsi, 3
-	mov r8, [rsp]
-	mov [r8], rsi
-
-	jmp .level
-
-.done:
-	pop r11
-	pop r12
-	pop r13
-	pop r14
-
-	ret
-
-space:
-	mov dil, ' '
-	; jmp print_chr
-
-page_region:
-	push rbx
-	push r12
-	push r13
-	push r14
-	push r15
-
-	mov r9, rdi
-
-	mov rdi, [r9]   ; ptr = mmap_entry->ptr
-	mov r10, [next_page]
-
-	push rdi
-
-	mov rax, 1 << 63
-
-	or rdi, rax
-	; call print_hex
-	; call space
-
-	mov rdi, [r9+8]
-	add rdi, [rsp]
-	or rdi, rax
-
-	; call print_hex
-	; call newline
-
-	pop rdi
-
-	; for   usable region (type = 1), set mmap_entry->used =  0
-	; for reserved region (type = 2), set mmap_entry->used = -1
-	xor rax, rax
-	xor rbx, rbx
-	mov eax, dword[r9+16]
-	cmp rax, 1
-	je .set_used
-	dec rbx
-.set_used:
-	mov [r9+16], rbx
-
-	mov r10, rdi
-	mov r15, rdi    ; r15 = end of region
-	add r15, [r9+8]
-
-	mov rax, 0xfff
-	not rax
-	and rdi, rax    ; round down to 0x1000 aligned
-
-	cmp rdi, r10
-	jb .get_tables
-
-	mov r10, rdi
-
-.get_tables:
-	call get_tables ; page tables into r11-r14
-
-	; start filling L1 map
-.l1:
-	mov rax, rdi
-	or rax, 3
-	mov [r11], rax
-
-	add rdi, 0x1000
-
-	cmp rdi, r10
-	jb .next
-
-	mov r10, rdi
-
-.next:
-	cmp rdi, r15    ; if next >= end
-	jae .done
-
-	; prepare rcx mask for later
-	mov rcx, -1
-	shl rcx, 3
-
-	; bump L1
-
-	add r11, 8
-	mov rax, r11
-	and rax, 0xfff
-	jnz .l1
-
-	; bump L2
-
-	add r12, 8
-	mov rax, r12
-	and rax, 0xfff
-	jnz .l2
-
-	; bump L3
-
-	add r13, 8
-	mov rax, r13
-	and rax, 0xfff
-	jnz .l3
-
-	; bump L4
-
-	add r14, 8
-	mov rax, r14
-	and rax, 0xfff
-	jnz .l4
-
-	; machine has more than 256TB of RAM, tell user to fuck off
-	jmp .bruh
-
-.l4:
-	mov r13, [r14]
-	and r13, rcx
-	jnz .l3
-
-	call alloc
-	mov r13, rsi
-	or rsi, 3
-	mov [r14], rsi
-
-.l3:
-	mov r12, [r13]
-	and r12, rcx
-	jnz .l2
-
-	call alloc
-	mov r12, rsi
-	or rsi, 3
-	mov [r13], rsi
-
-.l2:
-	mov r11, [r12]
-	and r11, rcx
-	jnz .l2
-
-	call alloc
-	mov r11, rsi
-	or rsi, 3
-	mov [r12], rsi
-
-	jmp .l1
-
-.done:
-	mov [next_page], r10
-
-	pop r15
-	pop r14
-	pop r13
-	pop r12
-	pop rbx
-
-	ret
-
-.bruh:
-	mov rdi, .bruh_msg
-	; call print_str
-	jmp $
-
-.bruh_msg: db "bruh why do you have more than 256TB of RAM (you fucking glow)", 10, 0
-
-; identity map available memory
-old_page_map:
-	mov r9, 0x0500                ; mmap_entry
-.entry:
-	cmp qword[r9], 0
-	je .done
-	call page_region
-	add r9, 24
-	jmp .entry
-.done:
-	ret