1 FILE_LICENCE ( GPL2_OR_LATER ) 2 3 #define PXENV_UNDI_ISR 0x0014 4 #define PXENV_UNDI_ISR_IN_START 1 5 #define PXENV_UNDI_ISR_OUT_OURS 0 6 #define PXENV_UNDI_ISR_OUT_NOT_OURS 1 7 8 #define IRQ_PIC_CUTOFF 8 9 #define ICR_EOI_NON_SPECIFIC 0x20 10 #define PIC1_ICR 0x20 11 #define PIC2_ICR 0xa0 12 13 .text 14 .arch i386 15 .code16 16 17 .section ".text16", "ax", @progbits 18 .globl undiisr 19 undiisr: 20 21 /* Preserve registers */ 22 pushw %ds 23 pushw %es 24 pushw %fs 25 pushw %gs 26 pushfl 27 pushal 28 29 /* Set up our segment registers */ 30 movw %cs:rm_ds, %ax 31 movw %ax, %ds 32 33 /* Check that we have an UNDI entry point */ 34 cmpw $0, pxeparent_entry_point 35 je chain 36 37 /* Issue UNDI API call */ 38 movw %ax, %es 39 movw $undinet_params, %di 40 movw $PXENV_UNDI_ISR, %bx 41 movw $PXENV_UNDI_ISR_IN_START, funcflag 42 pushw %es 43 pushw %di 44 pushw %bx 45 lcall *pxeparent_entry_point 46 cli /* Just in case */ 47 addw $6, %sp 48 cmpw $PXENV_UNDI_ISR_OUT_OURS, funcflag 49 jne eoi 50 51 trig: /* Record interrupt occurence */ 52 incb undiisr_trigger_count 53 54 eoi: /* Send EOI */ 55 movb $ICR_EOI_NON_SPECIFIC, %al 56 cmpb $IRQ_PIC_CUTOFF, undiisr_irq 57 jb 1f 58 outb %al, $PIC2_ICR 59 1: outb %al, $PIC1_ICR 60 jmp exit 61 62 chain: /* Chain to next handler */ 63 pushfw 64 lcall *undiisr_next_handler 65 66 exit: /* Restore registers and return */ 67 cli 68 popal 69 movzwl %sp, %esp 70 addr32 movl -20(%esp), %esp /* %esp isn't restored by popal */ 71 popfl 72 popw %gs 73 popw %fs 74 popw %es 75 popw %ds 76 iret 77 78 .section ".data16", "aw", @progbits 79 undinet_params: 80 status: .word 0 81 funcflag: .word 0 82 bufferlength: .word 0 83 framelength: .word 0 84 frameheaderlength: .word 0 85 frame: .word 0, 0 86 prottype: .byte 0 87 pkttype: .byte 0 88
