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| author | H. Peter Anvin <hpa@zytor.com> | 2008-03-26 16:25:35 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-03-26 16:25:35 -0700 |
| commit | 9eddd22a7b53b1d02fbae0d987df8af122924248 (patch) | |
| tree | 882f5152880b0b1aa2d7a0619d30065acc69fb16 /gpxe/src/arch/i386/drivers/net/undiisr.S | |
| parent | bbb8f15936b851e6a0ef6f7bb2c95197bff35994 (diff) | |
| download | syslinux-9eddd22a7b53b1d02fbae0d987df8af122924248.tar.gz | |
Add gPXE into the source tree; build unified imagesyslinux-3.70-pre7
Diffstat (limited to 'gpxe/src/arch/i386/drivers/net/undiisr.S')
| -rw-r--r-- | gpxe/src/arch/i386/drivers/net/undiisr.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/drivers/net/undiisr.S b/gpxe/src/arch/i386/drivers/net/undiisr.S new file mode 100644 index 00000000..a6c6c381 --- /dev/null +++ b/gpxe/src/arch/i386/drivers/net/undiisr.S @@ -0,0 +1,87 @@ +#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 + .section ".text16", "ax", @progbits + .section ".data16", "aw", @progbits + .code16 + + .section ".text16" + .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, undinet_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 *undinet_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" +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 |