diff options
Diffstat (limited to 'roms/ipxe/src/arch/i386/drivers/net/undiisr.S')
| -rw-r--r-- | roms/ipxe/src/arch/i386/drivers/net/undiisr.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/roms/ipxe/src/arch/i386/drivers/net/undiisr.S b/roms/ipxe/src/arch/i386/drivers/net/undiisr.S new file mode 100644 index 00000000..b27effe1 --- /dev/null +++ b/roms/ipxe/src/arch/i386/drivers/net/undiisr.S @@ -0,0 +1,87 @@ +FILE_LICENCE ( GPL2_OR_LATER ) + +#define PXENV_UNDI_ISR 0x0014 +#define PXENV_UNDI_ISR_IN_START 1 +#define PXENV_UNDI_ISR_OUT_OURS 0 +#define PXENV_UNDI_ISR_OUT_NOT_OURS 1 + +#define IRQ_PIC_CUTOFF 8 +#define ICR_EOI_NON_SPECIFIC 0x20 +#define PIC1_ICR 0x20 +#define PIC2_ICR 0xa0 + + .text + .arch i386 + .code16 + + .section ".text16", "ax", @progbits + .globl undiisr +undiisr: + + /* Preserve registers */ + pushw %ds + pushw %es + pushw %fs + pushw %gs + pushfl + pushal + + /* Set up our segment registers */ + movw %cs:rm_ds, %ax + movw %ax, %ds + + /* Check that we have an UNDI entry point */ + cmpw $0, pxeparent_entry_point + je chain + + /* Issue UNDI API call */ + movw %ax, %es + movw $undinet_params, %di + movw $PXENV_UNDI_ISR, %bx + movw $PXENV_UNDI_ISR_IN_START, funcflag + pushw %es + pushw %di + pushw %bx + lcall *pxeparent_entry_point + cli /* Just in case */ + addw $6, %sp + cmpw $PXENV_UNDI_ISR_OUT_OURS, funcflag + jne eoi + +trig: /* Record interrupt occurence */ + incb undiisr_trigger_count + +eoi: /* Send EOI */ + movb $ICR_EOI_NON_SPECIFIC, %al + cmpb $IRQ_PIC_CUTOFF, undiisr_irq + jb 1f + outb %al, $PIC2_ICR +1: outb %al, $PIC1_ICR + jmp exit + +chain: /* Chain to next handler */ + pushfw + lcall *undiisr_next_handler + +exit: /* Restore registers and return */ + cli + popal + movzwl %sp, %esp + addr32 movl -20(%esp), %esp /* %esp isn't restored by popal */ + popfl + popw %gs + popw %fs + popw %es + popw %ds + iret + + .section ".data16", "aw", @progbits +undinet_params: +status: .word 0 +funcflag: .word 0 +bufferlength: .word 0 +framelength: .word 0 +frameheaderlength: .word 0 +frame: .word 0, 0 +prottype: .byte 0 +pkttype: .byte 0 |