diff options
| author | Miguel <m.i@gmx.at> | 2018-09-03 15:18:16 +0200 |
|---|---|---|
| committer | Miguel <m.i@gmx.at> | 2018-09-03 15:18:16 +0200 |
| commit | 7eb87bf3f3fa6226657a7106eb255cbfa97758d2 (patch) | |
| tree | 2d7d2280d32180d18796999bf7687ebe5bf208df /asm/pic.asm | |
| parent | 76b3da6022310dd8edbbbfdf4f73f1696a559853 (diff) | |
big renaming
Diffstat (limited to 'asm/pic.asm')
| -rw-r--r-- | asm/pic.asm | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/asm/pic.asm b/asm/pic.asm deleted file mode 100644 index 901f854..0000000 --- a/asm/pic.asm +++ /dev/null @@ -1,84 +0,0 @@ -;************************************************************************ -; Map the 8259A PIC to use interrupts 32-47 within our interrupt table -;************************************************************************ - -[bits 32] - -global asm_pic_setup - -%define ICW_1 0x11 ; 00010001 binary. Enables initialization mode and we are sending ICW 4 - -%define PIC_1_CTRL 0x20 ; Primary PIC control register -%define PIC_2_CTRL 0xA0 ; Secondary PIC control register - -%define PIC_1_DATA 0x21 ; Primary PIC data register -%define PIC_2_DATA 0xA1 ; Secondary PIC data register - -%define IRQ_0 0x20 ; IRQs 0-7 mapped to use interrupts 0x20-0x27 -%define IRQ_8 0x28 ; IRQs 8-15 mapped to use interrupts 0x28-0x36 - -asm_pic_setup: - -; Send ICW 1 - Begin initialization ------------------------- - - ; Setup to initialize the primary PIC. Send ICW 1 - - mov al, ICW_1 - out PIC_1_CTRL, al - -; Send ICW 2 - Map IRQ base interrupt numbers --------------- - - ; Remember that we have 2 PICs. Because we are cascading with this second PIC, send ICW 1 to second PIC command register - - out PIC_2_CTRL, al - - ; send ICW 2 to primary PIC - - mov al, IRQ_0 - out PIC_1_DATA, al - - ; send ICW 2 to secondary controller - - mov al, IRQ_8 - out PIC_2_DATA, al - -; Send ICW 3 - Set the IR line to connect both PICs --------- - - ; Send ICW 3 to primary PIC - - mov al, 0x4 ; 0x04 => 0100, second bit (IR line 2) - out PIC_1_DATA, al ; write to data register of primary PIC - - ; Send ICW 3 to secondary PIC - - mov al, 0x2 ; 010=> IR line 2 - out PIC_2_DATA, al ; write to data register of secondary PIC - -; Send ICW 4 - Set x86 mode -------------------------------- - - mov al, 1 ; bit 0 enables 80x86 mode - - ; send ICW 4 to both primary and secondary PICs - - out PIC_1_DATA, al - out PIC_2_DATA, al - -; All done. Null out the data registers - - mov al, 0 - out PIC_1_DATA, al - out PIC_2_DATA, al - - ;mask -in al, 0x21 ; read in the primary PIC Interrupt Mask Register (IMR) -and al, 0x00 ; 0xEF => 11101111b. This sets the IRQ4 bit (Bit 5) in AL -out 0x21, al ; write the value back into IMR - - -in al, 0xA1 ; read in the primary PIC Interrupt Mask Register (IMR) -and al, 0x00 ; 0xEF => 11101111b. This sets the IRQ4 bit (Bit 5) in AL -out 0xA1, al ; write the value back into IMR - -ret - -;;;;;;;;;;;;;;;;;;;; |