-
Notifications
You must be signed in to change notification settings - Fork 2
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
23 changed files
with
1,177 additions
and
1,885 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -8,6 +8,7 @@ | |
| *.i | ||
| *.o | ||
| *.bin | ||
| *.com | ||
| *.dep | ||
| .vscode | ||
| cfg | ||
|
|
||
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,58 +1,53 @@ | ||
| ; code: language=nasm tabSize=8 | ||
| %include "defines.inc" | ||
|
|
||
| cold_boot: | ||
|
|
||
| ; From Super PC/Turbo XT BIOS | ||
|
|
||
| %define TURBO_ENABLED 1 | ||
|
|
||
| cld | ||
| mov al, 0 ; Prepare to initialize | ||
| out 0A0h, al ; no NMI interrupts | ||
| mov dx, 3D8h ; Load Color Graphic port | ||
| out dx, al ; no video display | ||
| mov dl, 0B8h ; Load Monochrome port | ||
| inc al ; no video display | ||
| out dx, al ; write it out | ||
| mov al, 10011001b ; Program 8255 PIA chip | ||
| out 63h, al ; Ports A & C, inputs | ||
| %ifdef TURBO_ENABLED | ||
| mov al, 10100101b ; Set (non)turbo mode | ||
| out 61h, al ; on main board | ||
| %endif | ||
| mov al, 01010100b ; IC 8253 inits memory refresh | ||
| out 43h, al ; chan 1 pulses IC 8237 to | ||
| mov al, 12h ; DMA every 12h clock ticks | ||
| out 41h, al ; 64K done in 1 millisecond | ||
| mov al, 01000000b ; Latch value 12h in 8253 clock | ||
| out 43h, al ; chip channel 1 counter | ||
|
|
||
| .init_dma: | ||
| mov al, 0 ; Do some initialization | ||
| out 81h, al ; DMA page reg, chan 2 | ||
| out 82h, al ; DMA page reg, chan 3 | ||
| out 83h, al ; DMA page reg, chan 0,1 | ||
| out 0Dh, al ; Stop DMA on 8237 chip | ||
| mov al, 01011000b ; Refresh auto-init dummy read | ||
| out 0Bh, al ; on channel 0 of DMA chip | ||
| mov al, 01000001b ; Block verify | ||
| out 0Bh, al ; on channel 1 of DMA chip | ||
| mov al, 01000010b ; Block verify | ||
| out 0Bh, al ; on channel 2 of DMA chip | ||
| mov al, 01000011b ; Block verify | ||
| out 0Bh, al ; on channel 3 of DMA chip | ||
| mov al, 0FFh ; Refresh byte count | ||
| out 1, al ; send lo order | ||
| out 1, al ; send hi order | ||
| inc ax ; Initialize 8237 command reg | ||
| out 8, al ; with zero | ||
| out 0Ah, al ; Enable DMA on all channels | ||
| mov al, 00110110b ; Set up 8253 timer chip | ||
| out 43h, al ; chan 0 is time of day | ||
| mov al, 0 ; Request a divide by | ||
| out 40h, al ; 65536 decimal | ||
| out 40h, al ; 0000h or 18.2 tick/sec | ||
| mov dx, 213h ; Expansion unit port | ||
| inc ax ; enable it | ||
| out dx, al ; do the enable | ||
|
|
||
| cold_boot: | ||
| cld | ||
| xor ax, ax ; Prepare to initialize | ||
| out IO_NMI_MASK, al ; no NMI interrupts | ||
|
|
||
| mov al, 10011001b ; Program 8255 PIA chip | ||
| out IO_PPI_CTL, al ; Ports A & C, inputs | ||
| mov al, PPIB_DEFAULT ; Setup PPI port B configuration (parity, turbo, etc) | ||
| out IO_PPI_B, al ; on main board | ||
|
|
||
| mov al, 01010100b ; IC 8253 inits memory refresh | ||
| out IO_PIT_CTL, al ; chan 1 pulses IC 8237 to | ||
| mov al, 12h ; DMA every 12h clock ticks | ||
| out IO_PIT_CH1, al ; 64K done in 1 millisecond | ||
| mov al, 01000000b ; Latch value 12h in 8253 clock | ||
| out IO_PIT_CTL, al ; chip channel 1 counter | ||
|
|
||
| .init_dma: | ||
| mov al, 0 ; Do some initialization | ||
| out IO_DMA_PG2, al ; DMA page reg, chan 2 | ||
| out IO_DMA_PG3, al ; DMA page reg, chan 3 | ||
| out IO_DMA_PG01, al ; DMA page reg, chan 0,1 | ||
| out IO_DMA_TEMP_CLR, al ; Stop DMA on 8237 chip | ||
| mov al, 01011000b ; Refresh auto-init dummy read | ||
| out IO_DMA_MODE, al ; on channel 0 of DMA chip | ||
| mov al, 01000001b ; Block verify | ||
| out IO_DMA_MODE, al ; on channel 1 of DMA chip | ||
| mov al, 01000010b ; Block verify | ||
| out IO_DMA_MODE, al ; on channel 2 of DMA chip | ||
| mov al, 01000011b ; Block verify | ||
| out IO_DMA_MODE, al ; on channel 3 of DMA chip | ||
| mov al, 0FFh ; Refresh byte count | ||
| out IO_DMA0_COUNT, al ; send lo order | ||
| out IO_DMA0_COUNT, al ; send hi order | ||
| inc ax ; Initialize 8237 command reg | ||
| out IO_DMA_CMD, al ; with zero | ||
| out IO_DMA_MASK, al ; Enable DMA on all channels | ||
|
|
||
| mov al, 00110110b ; Set up 8253 timer chip | ||
| out IO_PIT_CTL, al ; chan 0 is time of day | ||
| mov al, 0 ; Request a divide by | ||
| out IO_PIT_CH0, al ; 65536 decimal | ||
| out IO_PIT_CH0, al ; 0000h or 18.2 tick/sec | ||
|
|
||
| mov dx, 213h ; Expansion unit port | ||
| inc ax ; enable it | ||
| out dx, al ; do the enable |
Oops, something went wrong.