2013-01-08 21:05:02 +08:00
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#include "context.h"
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#define SPRG0 0x110 /* Special Purpose Register General 0 */
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#define SPRG1 0x111 /* Special Purpose Register General 1 */
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.globl rt_hw_interrupt_disable
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.globl rt_hw_interrupt_enable
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.globl rt_hw_context_switch
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.globl rt_hw_context_switch_to
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.globl rt_hw_context_switch_interrupt
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.globl rt_hw_systemcall_entry
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/*
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* rt_base_t rt_hw_interrupt_disable();
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* return the interrupt status and disable interrupt
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*/
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#if 0
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rt_hw_interrupt_disable:
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mfmsr r3 /* Disable interrupts */
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li r4,0
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ori r4,r4,MSR_EE
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andc r4,r4,r3
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SYNC /* Some chip revs need this... */
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mtmsr r4
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SYNC
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blr
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#else
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rt_hw_interrupt_disable:
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addis r4, r0, 0xFFFD
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ori r4, r4, 0x7FFF
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mfmsr r3
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and r4, r4, 3 /* Clear bits 14 and 16, corresponding to... */
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mtmsr r4 /* ...critical and non-critical interrupts */
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blr
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#endif
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/*
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* void rt_hw_interrupt_enable(rt_base_t level);
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* restore interrupt
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*/
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rt_hw_interrupt_enable:
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mtmsr r3
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SYNC
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blr
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/*
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* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
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* r3 --> from
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* r4 --> to
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*
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* r1: stack pointer
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*/
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rt_hw_systemcall_entry:
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mtspr SPRG0,r3 /* save r3 to SPRG0 */
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mtspr SPRG1,r4 /* save r4 to SPRG1 */
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lis r3,rt_thread_switch_interrput_flag@h
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ori r3,r3,rt_thread_switch_interrput_flag@l
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lwz r4,0(r3)
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cmpi cr0,0,r4,0x0 /* whether is 0 */
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beq _no_switch /* no switch, exit */
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li r4,0x0 /* set rt_thread_switch_interrput_flag to 0 */
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stw r4,0(r3)
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/* load from thread to r3 */
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lis r3,rt_interrupt_from_thread@h /* set rt_interrupt_from_thread */
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ori r3,r3,rt_interrupt_from_thread@l
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lwz r3,0(r3)
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cmpi cr0,0,r3,0x0 /* whether is 0 */
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beq _restore /* it's first switch, goto _restore */
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/* save r1:sp to thread[from] stack pointer */
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subi r1, r1, STACK_FRAME_SIZE
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stw r1, 0(r3)
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/* restore r3, r4 from SPRG */
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mfspr r3,SPRG0
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mfspr r4,SPRG0
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/* save registers */
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stw r0,GPR0(r1) /* save general purpose registers 0 */
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stmw r2,GPR2(r1) /* save general purpose registers 2-31 */
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mfusprg0 r0 /* save usprg0 */
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stw r0,USPRG0(r1)
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mfcr r0, /* save cr */
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stw r0,CR(r1)
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mfxer r0 /* save xer */
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stw r0,XER(r1)
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mfctr r0 /* save ctr */
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stw r0,CTR(r1)
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mflr r0 /* save lr */
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stw r0, LR(r1)
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mfsrr0 r0 /* save SRR0 and SRR1 */
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stw r0,SRR0(r1)
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mfsrr1 r0
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stw r0,SRR1(r1)
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_restore:
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/* get thread[to] stack pointer */
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lis r4,rt_interrupt_to_thread@h
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ori r4,r4,rt_interrupt_to_thread@l
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lwz r1,0(r4)
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lwz r1,0(r1)
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lwz r0,SRR1(r1) /* restore SRR1 and SRR0 */
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mtsrr1 r0
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lwz r0,SRR0(r1)
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mtsrr0 r0
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lwz r0,LR(r1) /* restore lr */
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mtlr r0
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lwz r0,CTR(r1) /* restore ctr */
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mtctr r0
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lwz r0,XER(r1) /* restore xer */
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mtxer r0
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lwz r0,CR(r1) /* restore cr */
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mtcr r0
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lwz r0,USPRG0(r1) /* restore usprg0 */
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// mtusprg0 r0
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lmw r2, GPR2(r1) /* restore general register */
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lwz r0,GPR0(r1)
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addi r1, r1, STACK_FRAME_SIZE
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/* RFI will restore status register and thus the correct priority*/
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rfi
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_no_switch:
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/* restore r3, r4 from SPRG */
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mfspr r3,SPRG0
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mfspr r4,SPRG0
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rfi
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/* void rt_hw_context_switch_to(to); */
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.globl rt_hw_context_switch_to
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rt_hw_context_switch_to:
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/* set rt_thread_switch_interrput_flag = 1 */
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lis r5,rt_thread_switch_interrput_flag@h
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ori r5,r5,rt_thread_switch_interrput_flag@l
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li r6, 0x01
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stw r6,0(r5)
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/* set rt_interrupt_from_thread = 0 */
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lis r5,rt_interrupt_from_thread@h
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ori r5,r5,rt_interrupt_from_thread@l
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li r6, 0x00
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stw r6,0(r5)
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/* set rt_interrupt_from_thread = to */
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lis r5,rt_interrupt_to_thread@h
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ori r5,r5,rt_interrupt_to_thread@l
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stw r3,0(r5)
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/* trigger a system call */
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sc
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blr
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/* void rt_hw_context_switch(from, to); */
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.globl rt_hw_context_switch
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rt_hw_context_switch:
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/* compare rt_thread_switch_interrupt_flag and set it */
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lis r5,rt_thread_switch_interrput_flag@h
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ori r5,r5,rt_thread_switch_interrput_flag@l
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lwz r6,0(r5)
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cmpi cr0,0,r6,0x1 /* whether is 1 */
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beq _reswitch /* set already, goto _reswitch */
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li r6,0x1 /* set rt_thread_switch_interrput_flag to 1*/
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stw r6,0(r5)
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/* set rt_interrupt_from_thread to 'from' */
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lis r5,rt_interrupt_from_thread@h
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ori r5,r5,rt_interrupt_from_thread@l
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stw r3,0(r5)
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_reswitch:
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/* set rt_interrupt_to_thread to 'to' */
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lis r6,rt_interrupt_to_thread@h
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ori r6,r6,rt_interrupt_to_thread@l
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stw r4,0(r6)
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/* trigger a system call */
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sc
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blr
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.globl rt_hw_context_switch_interrupt
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rt_hw_context_switch_interrupt:
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/* compare rt_thread_switch_interrupt_flag and set it */
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lis r5,rt_thread_switch_interrput_flag@h
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ori r5,r5,rt_thread_switch_interrput_flag@l
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lwz r6,0(r5)
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cmpi cr0,0,r6,0x1 /* whether is 1 */
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beq _int_reswitch /* set already, goto _reswitch */
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li r6,0x1 /* set rt_thread_switch_interrput_flag to 1*/
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stw r6,0(r5)
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/* set rt_interrupt_from_thread to 'from' */
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lis r5,rt_interrupt_from_thread@h
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ori r5,r5,rt_interrupt_from_thread@l
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stw r3,0(r5)
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_int_reswitch:
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/* set rt_interrupt_to_thread to 'to' */
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lis r6,rt_interrupt_to_thread@h
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ori r6,r6,rt_interrupt_to_thread@l
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stw r4,0(r6)
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blr
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