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author | Freya Murphy <freya@freyacat.org> | 2024-02-03 00:50:07 -0500 |
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committer | Freya Murphy <freya@freyacat.org> | 2024-02-03 00:53:58 -0500 |
commit | 90a6065691beee52bf5309916fba98f7580d27be (patch) | |
tree | 0b5375d20c189f62d394c473d371f7bf7f1d3fc5 /src/arch/amd64/pic.c | |
parent | improved debugger, refactored (diff) | |
download | corn-90a6065691beee52bf5309916fba98f7580d27be.tar.gz corn-90a6065691beee52bf5309916fba98f7580d27be.tar.bz2 corn-90a6065691beee52bf5309916fba98f7580d27be.zip |
refactor, new arch dirs, (wip) page alloc on write, hsv screen (convert to userspace later), other fixes
Diffstat (limited to 'src/arch/amd64/pic.c')
-rw-r--r-- | src/arch/amd64/pic.c | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/src/arch/amd64/pic.c b/src/arch/amd64/pic.c deleted file mode 100644 index c25856b..0000000 --- a/src/arch/amd64/pic.c +++ /dev/null @@ -1,89 +0,0 @@ -#include "bindings.h" -#include "pic.h" - -#define PIC1 0x20 /* IO base address for master PIC */ -#define PIC2 0xA0 /* IO base address for slave PIC */ -#define PIC1_COMMAND PIC1 -#define PIC1_DATA (PIC1+1) -#define PIC2_COMMAND PIC2 -#define PIC2_DATA (PIC2+1) - -#define PIC_EOI 0x20 /* End-of-interrupt command code */ - -#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */ -#define ICW1_SINGLE 0x02 /* Single (cascade) mode */ -#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */ -#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */ -#define ICW1_INIT 0x10 /* Initialization - required! */ - -#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */ -#define ICW4_AUTO 0x02 /* Auto (normal) EOI */ -#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */ -#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */ -#define ICW4_SFNM 0x10 /* Special fully nested (not) */ - -void pic_remap(void) { - uint8_t a1, a2; - - a1 = inb(PIC1_DATA); // save masks - a2 = inb(PIC2_DATA); - - outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4); // starts the initialization sequence (in cascade mode) - io_wait(); - outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4); - io_wait(); - outb(PIC1_DATA, PIC_REMAP_OFFSET); // ICW2: Master PIC vector offset - io_wait(); - outb(PIC2_DATA, PIC_REMAP_OFFSET + 8); // ICW2: Slave PIC vector offset - io_wait(); - outb(PIC1_DATA, 4); // ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100) - io_wait(); - outb(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010) - io_wait(); - - outb(PIC1_DATA, ICW4_8086); // ICW4: have the PICs use 8086 mode (and not 8080 mode) - io_wait(); - outb(PIC2_DATA, ICW4_8086); - io_wait(); - - outb(PIC1_DATA, a1); // restore saved masks. - outb(PIC2_DATA, a2); -} - -void pic_mask(int irq) { - uint16_t port; - uint8_t mask; - if (irq < 8) { - port = PIC1_DATA; - } else { - port = PIC2_DATA; - irq -= 8; - } - mask = inb(port) | (1 << irq); - outb(port, mask); -} - -void pic_unmask(int irq) { - uint16_t port; - uint8_t mask; - if (irq < 8) { - port = PIC1_DATA; - } else { - irq -= 8; - port = PIC2_DATA; - } - mask = inb(port) & ~(1 << irq); - outb(port, mask); -} - -void pic_disable(void) { - outb(PIC1_DATA, 0xff); - outb(PIC2_DATA, 0xff); -} - -void pic_eoi(int irq) { - if (irq >= 8) { - outb(PIC2_COMMAND, PIC_EOI); - } - outb(PIC1_COMMAND, PIC_EOI); -} |