chore: random docs
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kernel/dev/at/intro.txt
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53
kernel/dev/at/intro.txt
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@ -0,0 +1,53 @@
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File: IBM PC/AT
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About: I/O Address Map
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> +---------------+-------------------------+
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> | 0x000 - 0x01F | DMA controller 1 |
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> +---------------+-------------------------+
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> | 0x020 - 0x03F | 8259A, Primary |
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> +---------------+-------------------------+
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> | 0x040 - 0x05F | Timer |
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> +---------------+-------------------------+
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> | 0x060 - 0x06F | Keyboard |
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> +---------------+-------------------------+
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> | 0x070 - 0x07F | CMOS |
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> +---------------+-------------------------+
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> | 0x080 - 0x09F | DMA page register |
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> +---------------+-------------------------+
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> | 0x0A0 - 0x0BF | 8259A, Secondary |
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> +---------------+-------------------------+
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> | 0x0C0 - 0x0DF | DMA controller 2 |
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> +---------------+-------------------------+
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> | 0x0F0 | Clear Math Coprocessor |
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> +---------------+-------------------------+
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> | 0x0F1 | Reset Math Coprocessor |
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> +---------------+-------------------------+
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> | 0x0F8 - 0x0FF | Math Coprocessor |
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> +---------------+-------------------------+
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> | 0x1F0 - 0x1F8 | Fixed Disk |
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> +---------------+-------------------------+
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> | 0x200 - 0x207 | Game I/O |
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> +---------------+-------------------------+
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> | 0x278 - 0x27F | Parallel printer port 2 |
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> +---------------+-------------------------+
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> | 0x2F8 - 0x2FF | Serial port 2 |
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> +---------------+-------------------------+
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> | 0x300 - 0x31F | Prototype card |
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> +---------------+-------------------------+
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> | 0x360 - 0x363 | PC Network (low) |
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> +---------------+-------------------------+
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> | 0x368 - 0x36B | PC Network (high) |
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> +---------------+-------------------------+
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> | 0x378 - 0x37F | Parallel printer port 1 |
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> +---------------+-------------------------+
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> | 0x380 - 0x38F | SDLC, bisynchronous 2 |
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> +---------------+-------------------------+
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> | 0x3B0 - 0x3BF | Monochrome Display |
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> +---------------+-------------------------+
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> | 0x3D0 - 0x3DF | Color Monitor Adapter |
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> +---------------+-------------------------+
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> | 0x3F0 - 0x3F7 | Diskette controller |
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> +---------------+-------------------------+
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> | 0x3F8 - 0x3FF | Serial port 1 |
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> +---------------+-------------------------+
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@ -1,3 +1,5 @@
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;; File: vga_console.inc
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VGA_COLUMNS = 80
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VGA_LINES = 25
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VGA_BASE = 0xC03B0000
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@ -0,0 +1,10 @@
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idt_set_table:
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ret
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idt_setup:
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ret
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pIdt:
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dw ?
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dd ?
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@ -2,6 +2,14 @@ File: Introduction
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About: kernel memory map
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Kernel Source Overview:
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> kernel
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> ├── dev
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> ├── fs
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> └── mm
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>
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> Physical map virtual map
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> +---------------+
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17
kernel/lock.inc
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17
kernel/lock.inc
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@ -0,0 +1,17 @@
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;;
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lock_acquire:
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lock bts [eax], 0
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jnc .end
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@@:
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pause
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test [eax], 1
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jne @b
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lock bts [eax], 0
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jc @b
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.end:
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ret
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release:
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mov [eax], 0
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@ -1,5 +1,6 @@
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;; File: mm.inc
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;; StupidOS Memory Manager
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include "pmm.inc"
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mm_init:
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@ -13,11 +14,23 @@ mm_init:
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mov esi, szMsgMmKernelPgDir
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call klog
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;; Map kernel
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; clear page dir
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mov ecx, 4096
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xor al, al
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mov edi, [pKernelPgDir]
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rep stosb
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;; Map kernel and kmemory
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call pmm_alloc_page
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push eax
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mov ecx, 4096
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mov edi, eax
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xor al, al
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rep stosb
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pop eax
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;; Map video
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;; Map low memory at ????
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;; Map free memory
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70
kernel/sys/mmu.inc
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70
kernel/sys/mmu.inc
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@ -0,0 +1,70 @@
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;; File: mmu.inc
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;;
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;; About: Address Translation
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;;
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;; Since we don't use segmentation, this is how address translation works
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;; > 31 21 11 0
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;; > +--------+--------+--------+
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;; > | DIR | PAGE | OFFSET |
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;; > +--------+--------+--------+
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;; > |
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;; > v
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;; > Page Translation
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;; > |
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;; > 31 v 0
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;; > +--------------------------+
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;; > | Pyshical address |
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;; > +--------------------------+
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;;
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;; About: Page Translation
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;;
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;; > +--------+--------+--------+ +--------+
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;; > | DIR | PAGE | OFFSET |-----+ | Phys |
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;; > +--------+--------+--------+ +------>| addr |
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;; > | | | |
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;; > | +----+ +--------+
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;; > | Page Dir | +---> Page Frame
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;; > | +---------+ | +--------+ |
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;; > | | | | | | |
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;; > +->| PDE |-+ +->| PTE |-+
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;; > | | | | |
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;; > +---------+ | +--------+
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;; > +----> Page Table
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;; >
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;;
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;; Defines: Page Directory Flags
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;; PDE_P - Present
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;; PDE_W - Writable
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;; PDE_U - User
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;; PDE_PWT - Write-Through
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;; PDE_PS - 4MiB page
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PDE_P equ 1 << 0
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PDE_W equ 1 << 1
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PDE_U equ 1 << 2
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PDE_PWT equ 1 << 3
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PDE_PCD equ 1 << 4
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PDE_A equ 1 << 5
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PDE_D equ 1 << 6
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PDE_PS equ 1 << 7
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PDE_G equ 1 << 8
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;; Defines: Page Table Flags
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;; PTE_P - Present
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;; PTE_W - Writable
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;; PTE_U - User
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;; PTE_PWT - Write-Through
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;; PTE_PCD - Cache Disable
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;; PTE_A - Accessed
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;; PTE_D - Dirty
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;; PTE_PAT - TODO
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;; PTE_G - TODO
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PTE_P equ 1 << 0
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PTE_W equ 1 << 1
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PTE_U equ 1 << 2
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PTE_PWT equ 1 << 3
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PTE_PCD equ 1 << 4
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PTE_A equ 1 << 5
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PTE_D equ 1 << 6
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PTE_PAT equ 1 << 7
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PTE_G equ 1 << 8
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126
kernel/sys/register.inc
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126
kernel/sys/register.inc
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;; File: registers.inc
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;; =========================================================================
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;; Control Registers
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;; =========================================================================
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;; Defines: CR0
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;; CR0_PE - Protected Mode Enable
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;; CR0_MP - Monitor co-processor
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;; CR0_EM - x87 FPU Emulation
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;; CR0_TS - Task switched
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;; CR0_ET - Extension type
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;; CR0_NE - Numeric error
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;; CR0_WP - Write protect
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;; CR0_AM - Alignment mask
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;; CR0_NW - Not-write through
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;; CR0_CD - Cache disable
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;; CR0_PG - Paging
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CR0_PE equ 1 << 0
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CR0_MP equ 1 << 1
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CR0_EM equ 1 << 2
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CR0_TS equ 1 << 3
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CR0_ET equ 1 << 4
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CR0_NE equ 1 << 5
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CR0_WP equ 1 << 16
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CR0_AM equ 1 << 18
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CR0_NW equ 1 << 29
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CR0_CD equ 1 << 30
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CR0_PG equ 1 << 31
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;; Defines: CR3
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;; CR3_PWT - Page-level Write-Through
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;; CR3_PCD - Page-level Cache Disable
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CR3_PWT equ 1 << 3
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CR3_PCD equ 1 << 4
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;; Defines: CR4
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;; CR4_VME - Virtual 8086 Mode Extensions
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;; CR4_PVI - Protected-mode Virtual Interrupts
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;; CR4_TSD - Time Stamp Disable
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;; CR4_DE - Debugging Extensions
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;; CR4_PSE - Page Size Extension
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;; CR4_PAE - Physical Address Extension
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;; CR4_MCE - Machine Check Exception
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;; CR4_PGE - Page Global Enabled
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;; CR4_PCE - Performance-Monitoring Counter enable
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;; CR4_OSFXSR - Operating system support for FXSAVE and FXRSTOR
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;; instructions
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;; CR4_OSXMMEXCPT - Operating System Support for Unmasked SIMD
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;; Floating-Point Excepions
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;; CR4_UMIP - User-Mode Instruction Prevention
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;; CR4_VMXE - Virtual Machine Extensions Enable
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;; CR4_SMXE - Safer Mode Extensions Enable
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;; CR4_FSGSBASE -
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;; CR4_PCIDE - PCID Enable
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;; CR4_OSXSSAVE - XSAVE and Processor Extended States Enable
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;; CR4_SMEP - Supervisor Mode Execution Protection Enable
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;; CR4_SMAP - Supervisor Mode Access Prevention Enable
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;; CR4_PKE - Protection Key Enable
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;; CR4_CET - Control-flow Enforcement Technology
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;; CR4_PKS - Enable Protection Keys for Supervisor-Mode Pages
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CR4_VME equ 1 << 0
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CR4_PVI equ 1 << 1
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CR4_TSD equ 1 << 2
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CR4_DE equ 1 << 3
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CR4_PSE equ 1 << 4
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CR4_PAE equ 1 << 5
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CR4_MCE equ 1 << 6
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CR4_PGE equ 1 << 7
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CR4_PCE equ 1 << 8
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CR4_OSDXSR equ 1 << 9
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CR4_OSXMMEXCPT equ 1 << 10
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CR4_UMIP equ 1 << 11
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CR4_VMXE equ 1 << 13
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CR4_SMXE equ 1 << 14
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CR4_FSGSBASE equ 1 << 16
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CR4_PCIDE equ 1 << 17
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CR4_OSXSAVE equ 1 << 18
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CR4_SMEP equ 1 << 20
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CR4_SMAP equ 1 << 21
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CR4_PKE equ 1 << 22
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CR4_CET equ 1 << 23
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CR4_PKS equ 1 << 24
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;; =========================================================================
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;; eflags
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;; =========================================================================
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;; Defines: EFLAGS
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;; EFLAGS_CF - Carry flag
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;; EFLAGS_PF - Parity flag
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;; EFLAGS_AF - Auxiliary flag
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;; EFLAGS_ZF - Zero flag
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;; EFLAGS_SF - Sign flag
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;; EFLAGS_TF - Trap flag
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;; EFLAGS_IF - Interrupt enable flag
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;; EFLAGS_DF - Direction flag
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;; EFLAGS_OF - Overflow flag
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;; EFLAGS_IOPL1 - I/O privilege flag
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;; EFLAGS_IOPL2 - I/O privilege flag
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;; EFLAGS_NT - Nested task flag
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;; EFLAGS_RF - Resume flag
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;; EFLAGS_VM - Virtual 8086 mode flag
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;; EFLAGS_AC - Alignment check
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;; EFLAGS_VIF - Virtual Interrupt flag
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;; EFLAGS_VIP - Virtual Interrupt pending
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;; EFLAGS_ID - CPUID instruction available
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EFLAGS_CF equ 1 << 0
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EFLAGS_PF equ 1 << 2
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EFLAGS_AF equ 1 << 4
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EFLAGS_ZF equ 1 << 6
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EFLAGS_SF equ 1 << 7
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EFLAGS_TF equ 1 << 8
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EFLAGS_IF equ 1 << 9
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EFLAGS_DF equ 1 << 10
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EFLAGS_OF equ 1 << 11
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EFLAGS_IOPL1 equ 1 << 12
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EFLAGS_IOPL2 equ 1 << 13
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EFLAGS_NT equ 1 << 14
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EFLAGS_RF equ 1 << 16
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EFLAGS_VM equ 1 << 17
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EFLAGS_AC equ 1 << 18
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EFLAGS_VIF equ 1 << 19
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EFLAGS_VIP equ 1 << 20
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EFLAGS_ID equ 1 << 21
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