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- 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
|
