feat(kernel): map low memory using bitmap
This commit is contained in:
parent
7f5c45b19d
commit
a36c8b00ed
11 changed files with 235 additions and 70 deletions
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@ -12,11 +12,16 @@ ASMINCS = sys/bootinfo.inc \
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sys/register.inc
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KERNEL = vmstupid.sys
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MM_SRCS = bootstrap.inc \
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mm.inc \
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pmm.inc \
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vmm.inc
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SRCS = kernel.asm \
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const.inc \
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klog.inc \
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mm/mm.old.inc \
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mm/pmm.old.inc \
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$(addprefix mm/, $(MM_SRCS)) \
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lock.inc \
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gdt.inc \
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isr.inc \
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@ -16,3 +16,7 @@ BUILD_DATE equ "@DATE@"
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; ------------- OTHER -----------
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CR = 0x0D
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LF = 0x0A
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CONFIG_COMPAT_I386 = 0
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CONFIG_TRACE_PMM = 1
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@ -11,6 +11,40 @@ CGA_CURSOR_LOW = 0xF
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CGA_COLUMNS = 80
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CGA_LINES = 24
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CGA_COLOR_FG_BLACK = 0x00
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CGA_COLOR_FG_BLUE = 0x01
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CGA_COLOR_FG_GREEN = 0x02
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CGA_COLOR_FG_CYAN = 0x03
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CGA_COLOR_FG_RED = 0x04
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CGA_COLOR_FG_MAGENTA = 0x05
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CGA_COLOR_FG_BROWN = 0x06
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CGA_COLOR_FG_LIGHT_GRAY = 0x07
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CGA_COLOR_FG_DARK_GRAY = 0x08
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CGA_COLOR_FG_LIGHT_BLUE = 0x09
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CGA_COLOR_FG_LIGHT_GREEN = 0x0A
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CGA_COLOR_FG_LIGHT_CYAN = 0x0B
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CGA_COLOR_FG_LIGHT_RED = 0x0C
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CGA_COLOR_FG_LIGHT_MAGENTA = 0x0D
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CGA_COLOR_FG_YELLOW = 0x0E
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CGA_COLOR_FG_WHITE = 0x0F
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CGA_COLOR_BG_BLACK = 0x00
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CGA_COLOR_BG_BLUE = 0x10
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CGA_COLOR_BG_GREEN = 0x20
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CGA_COLOR_BG_CYAN = 0x30
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CGA_COLOR_BG_RED = 0x40
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CGA_COLOR_BG_MAGENTA = 0x50
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CGA_COLOR_BG_BROWN = 0x60
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CGA_COLOR_BG_LIGHT_GRAY = 0x70
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CGA_COLOR_BG_DARK_GRAY = 0x80
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CGA_COLOR_BG_LIGHT_BLUE = 0x90
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CGA_COLOR_BG_LIGHT_GREEN = 0xA0
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CGA_COLOR_BG_LIGHT_CYAN = 0xB0
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CGA_COLOR_BG_LIGHT_RED = 0xC0
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CGA_COLOR_BG_LIGHT_MAGENTA = 0xD0
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CGA_COLOR_BG_YELLOW = 0xE0
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CGA_COLOR_BG_WHITE = 0xF0
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;; Function: cga_getpos
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;;
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;; Out:
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@ -94,7 +128,7 @@ cga_putc:
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mov cx, [ebp-0x2]
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shl cx, 1
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add edx, ecx
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mov ah, 0x07
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mov ah, byte [cga_color]
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mov word [edx], ax
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mov cx, [ebp-0x2]
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inc cx
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@ -134,3 +168,5 @@ cga_putc:
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cga_device:
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db 'video', 0, 0, 0
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cga_color db CGA_COLOR_FG_LIGHT_GRAY
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@ -46,20 +46,15 @@ kmain:
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call mm_bootstrap
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xchg bx, bx
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; init pmm (kend, 0x400000)
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mov eax, kend
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mov ebx, 0xC0400000
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call pmm_init
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; init vmm
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call mm_init
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;call mm_init
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mov eax, 0xC0400000
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mov ebx, [stBootInfo.high_mem]
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add ebx, KERNEL_VIRT_BASE
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call pmm_free_range
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;mov eax, 0xC0400000
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;mov ebx, [stBootInfo.high_mem]
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;add ebx, KERNEL_VIRT_BASE
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;call pmm_free_range
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;mov eax, [stBootInfo.low_mem]
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;call heap_init
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@ -121,8 +116,7 @@ kmain:
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include 'klog.inc'
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include 'dev/console.inc'
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include 'dev/dev.inc'
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include 'mm/bootstrap.inc'
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include 'mm/mm.old.inc'
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include 'mm/mm.inc'
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include 'lock.inc'
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include 'gdt.inc'
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include 'syscall.inc'
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@ -4,6 +4,12 @@
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COM1 = 0x3F8
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macro TRACE {
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mov byte [cga_color], CGA_COLOR_FG_CYAN
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call klog
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mov byte [cga_color], CGA_COLOR_FG_LIGHT_GRAY
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}
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;; Function: _klog_print_str
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;;
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;; In: EAX - Null-terminated string to print
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@ -213,7 +219,7 @@ klog:
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; display log time
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call _klog_print_time
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mov ecx, 4
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mov ecx, 8
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.begin:
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mov al, [esi]
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or al, al
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@ -299,6 +305,8 @@ klog:
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mov eax, szCRLF
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call _klog_print_str
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pop esi
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leave
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ret
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9
kernel/mm/mm.inc
Normal file
9
kernel/mm/mm.inc
Normal file
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@ -0,0 +1,9 @@
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MM_KERNEL_PTE_BASE = 0xFFC00000
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include '../sys/mmu.inc'
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include 'bootstrap.inc'
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include 'pmm.inc'
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include 'vmm.inc'
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mm_init:
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ret
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@ -1,34 +0,0 @@
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MM_PTE_BASE = 0xFFC00000
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MM_VIRT_TEMP = 0xD0000000
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;; EAX - Physical address to map
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mm_map_temp:
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mov ecx, MM_PTE_BASE + (MM_VIRT_TEMP shr 12)
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or eax, 0x3
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mov [ecx], eax
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if COMPAT_I386
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mov eax, 0x40000 + (1023 * PAGE_SIZE)
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mov cr3, eax
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else
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mov eax, MM_VIRT_TEMP
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invlpg [eax]
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end if
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ret
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mm_unmap_temp:
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mov ecx, MM_PTE_BASE + (MM_VIRT_TEMP shr 12)
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mov dword [ecx], 0
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if COMPAT_I386
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mov eax, 0x40000 + (1023 * PAGE_SIZE)
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mov cr3, eax
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else
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mov eax, MM_VIRT_TEMP
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invlpg [eax]
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end if
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ret
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mm_init:
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ret
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@ -8,6 +8,13 @@
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;; > └─────┘ └─────┘
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;;
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;;; MARK: macros and structs
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;; Constant: PMM_VIRT_TEMP
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PMM_VIRT_TEMP = 0xD0000000
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PMM_BITMAP_USED = 0x0
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PMM_BITMAP_FREE = 0x1
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;; Macro: PAGE_ALIGN_UP reg
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macro PAGE_ALIGN_UP reg {
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add reg, PAGE_SIZE - 1
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@ -26,37 +33,128 @@ struc PMMFreeRange {
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}
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DEFN PMMFreeRange
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;;; MARK: private functions
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;; Function: _pmm_map_temp_page
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;;
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;; In:
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;; EAX - physical address to map at <PMM_VIRT_TEMP>
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_pmm_map_temp_page:
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mov ecx, MM_KERNEL_PTE_BASE + (PMM_VIRT_TEMP shr 12) * 4
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or eax, 0x3
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mov [ecx], eax
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if CONFIG_COMPAT_I386
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mov eax, 0x40000 + (1023 * PAGE_SIZE)
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mov cr3, eax
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else
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mov eax, PMM_VIRT_TEMP
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invlpg [eax]
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end if
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ret
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_pmm_unmap_temp_page:
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mov ecx, MM_KERNEL_PTE_BASE + (PMM_VIRT_TEMP shr 12) * 4
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mov dword [ecx], 0
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if CONFIG_COMPAT_I386
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mov eax, 0x40000 + (1023 * PAGE_SIZE)
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mov cr3, eax
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else
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mov eax, PMM_VIRT_TEMP
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invlpg [eax]
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end if
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ret
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;; Function: _pmm_init_region
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;;
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;; Add new memory region to the linked list.
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;;
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;; In:
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;; EAX - Start
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;; EDX - End
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;;
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_pmm_init_region:
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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, eax
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mov esi, edx
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push edx
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push eax
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call _pmm_map_temp_page
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mov eax, szMsgPmmFreeRange
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call klog
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pop eax
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pop edx
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call _pmm_map_temp_page
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xor ecx, ecx
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mov [MM_VIRT_TEMP], edx
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mov [MM_VIRT_TEMP + PMMFreeRange.next], ecx
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mov ecx, [pPMMFreeListHead]
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mov [PMM_VIRT_TEMP], esi
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mov [PMM_VIRT_TEMP + PMMFreeRange.next], ecx
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mov ecx, [pPmmFreeListHead]
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or ecx, ecx
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jz @f
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mov [MM_VIRT_TEMP + PMMFreeRange.next], ecx
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mov [PMM_VIRT_TEMP + PMMFreeRange.next], ecx
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@@:
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mov [pPMMFreeListHead], eax
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mov [pPmmFreeListHead], edi
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call _pmm_unmap_temp_page
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pop edi
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pop esi
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leave
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ret
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_pmm_init_low_memory:
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push ebp
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mov ebp, esp
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mov eax, [stBootInfo.low_mem]
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push eax
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xor eax, eax
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push eax
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mov eax, szMsgPmmFreeRange
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call klog
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add esp, 8
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; clear bitmap
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push edi
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xor eax, eax
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mov ecx, 8
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mov edi, au32PmmLowMemBitmap
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rep stosd
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mov edi, au32PmmLowMemBitmap
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xor eax, eax
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xor ecx, ecx
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@@:
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add eax, PAGE_SIZE
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cmp eax, [stBootInfo.low_mem]
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jg @f
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mov ebx, 1
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shl ebx, cl
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or [edi], ebx
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inc ecx
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cmp ecx, 32
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jb @b
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xor ecx, ecx
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add edi, 4
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jmp @b
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@@:
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pop edi
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leave
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ret
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;;; MARK: public functions
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;; Function: pmm_alloc
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;;
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;; In:
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@ -64,7 +162,18 @@ _pmm_init_region:
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;;
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;; Out:
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;; EAX - first page physical address, 0 on error
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;;
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pmm_alloc:
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mov eax, [pPmmFreeListHead]
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or eax, eax
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jnz @f
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mov edx, ENOMEM
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ret ; no memory left :'(
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@@:
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call _pmm_map_temp_page
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call _pmm_unmap_temp_page
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ret
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;; Function: pmm_alloc_page
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@ -84,33 +193,47 @@ pmm_alloc_page:
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pmm_free:
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ret
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;; Function: _pmm_init_region
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;;
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;; Add new memory region to the linked list.
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;;
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;; In:
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;; EAX - Start
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;; EDX - End
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;;
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;; Function: pmm_init
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;;
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;; Out:
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;; EAX - return -1 on error
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pmm_init:
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mov eax, szMsgMmInit
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mov eax, szMsgPmmInit
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call klog
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mov eax, kend
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call _pmm_init_low_memory
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if CONFIG_TRACE_PMM
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mov byte [cga_color], CGA_COLOR_FG_BLUE
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push dword [au32PmmLowMemBitmap + 28]
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push dword [au32PmmLowMemBitmap + 24]
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push dword [au32PmmLowMemBitmap + 20]
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push dword [au32PmmLowMemBitmap + 16]
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push dword [au32PmmLowMemBitmap + 12]
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push dword [au32PmmLowMemBitmap + 8]
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push dword [au32PmmLowMemBitmap + 4]
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push dword [au32PmmLowMemBitmap]
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mov eax, szTracePmmBitmap
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TRACE
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add esp, 32
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end if
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mov eax, kend - KERNEL_VIRT_BASE
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PAGE_ALIGN_UP eax
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mov edx, 0x400000
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sub edx, eax
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jle @f
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cmp edx, PAGE_SIZE
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jle @f
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mov edx, 0x400000
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call _pmm_init_region
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@@:
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@ -122,10 +245,19 @@ pmm_init:
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xor eax, eax ; TODO: check if enough memory and so on
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ret
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;;; MARK: variables
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;; Variable: pPMMFreeListHead
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;; Hold first free list entry physical address
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pPMMFreeListHead dd 0
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pPmmFreeListHead dd 0
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au32PmmLowMemBitmap rd 8
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szMsgPmmInit db "PMM: initialize", 0
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szMsgPmmFreeRange db "PMM: add free memory region %x - %x", 0
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szErrorNoMemLeft db "Error(PMM): no free memory left", 0
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if CONFIG_TRACE_PMM
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szTracePmmBitmap db "Trace(PMM): low memory bitmap", CR, LF, \
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" %x", CR, LF, " %x", CR, LF, " %x", CR, LF, " %x", CR, LF, \
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" %x", CR, LF, " %x", CR, LF, " %x", CR, LF, " %x", 0
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end if
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@ -1,2 +1,13 @@
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ENXIO = 6
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;; File: errno.inc
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;; Constant: ENODEV
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;; No such device.
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ENODEV = 19
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;; Constant: ENOMEM
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;; Not enough space.
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ENOMEM = 20
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;; Constant: ENXIO
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;; No such device or address.
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ENXIO = 6
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