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nuclear@11
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1 .data
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2 .align 4
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3 .short 0
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4 /* memory reserved for set_idt */
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5 lim:.short 0
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6 addr:.long 0
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7
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8 .text
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9 /* set_idt(uint32_t addr, uint16_t limit)
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10 * loads the IDTR with the new address and limit for the IDT */
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11 .globl set_idt
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12 set_idt:
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13 movl 4(%esp), %eax
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14 movl %eax, (addr)
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15 movw 8(%esp), %ax
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16 movw %ax, (lim)
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17 lidt (lim)
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18 ret
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19
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nuclear@25
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20 /* get_intr_state()
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21 * returns 1 if interrutps are enabled, 0 if disabled */
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22 .globl get_intr_state
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23 get_intr_state:
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24 pushf
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25 popl %eax
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26 shr $9, %eax /* bit 9 of eflags is IF */
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27 andl $1, %eax
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28 ret
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29
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30 /* set_intr_state(int state)
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31 * enables interrupts if the argument is non-zero, disables them otherwise */
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32 .globl set_intr_state
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33 set_intr_state:
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34 cmpl $0, 4(%esp)
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35 jz 0f
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36 sti
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37 ret
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38 0: cli
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39 ret
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40
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41
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42 /* interrupt entry with error code macro
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43 * this macro generates an interrupt entry point for the
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44 * exceptions which include error codes in the stack frame
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45 */
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46 .macro ientry_err n name
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47 .globl intr_entry_\name
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48 intr_entry_\name:
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49 pushl $\n
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50 jmp intr_entry_common
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51 .endm
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52
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53 /* interrupt entry without error code macro
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54 * this macro generates an interrupt entry point for the interrupts
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55 * and exceptions which do not include error codes in the stack frame
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56 * it pushes a dummy error code (0), to make the stack frame identical
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57 */
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58 .macro ientry_noerr n name
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59 .globl intr_entry_\name
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60 intr_entry_\name:
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61 pushl $0
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62 pushl $\n
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63 jmp intr_entry_common
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64 .endm
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65
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66 /* common code used by all entry points. calls dispatch_intr()
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67 * defined in intr.c
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68 */
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69 .extern dispatch_intr
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70 intr_entry_common:
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71 pusha
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72 call dispatch_intr
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73 intr_ret_local:
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74 popa
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75 /* remove error code and intr num from stack */
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76 add $8, %esp
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77 iret
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78
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79 /* intr_ret is called by context_switch to return from the kernel
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80 * to userspace. The argument is a properly formed intr_frame
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81 * structure with the saved context of the new task.
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82 *
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83 * First thing to do is remove the return address pointing back
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84 * to context_switch, which then leaves us with a proper interrupt
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85 * stack frame, so we can jump right in the middle of the regular
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86 * interrupt return code above.
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87 */
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88 .globl intr_ret
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89 intr_ret:
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90 add $4, %esp
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91 jmp intr_ret_local
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92
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93 /* by including interrupts.h with ASM defined, the macros above
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94 * are expanded to generate all required interrupt entry points
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95 */
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96 #define ASM
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97 #include <interrupts.h>
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