cpu_switch now works, for kthreads at least.
This commit is contained in:
Benno Rice
parent
0e1338662a
commit
677bcc872c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=91486
@ -71,45 +71,58 @@
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* Find a runnable thread and switch to it.
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*/
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ENTRY(cpu_switch)
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mflr %r30
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mfsprg %r3,%r0 /* Get the pcpu pointer */
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mfsprg %r3,0 /* Get the pcpu pointer */
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lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */
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lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */
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stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
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mfcr %r4 /* Save the condition register */
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stw %r4,PCB_CR(%r3)
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mr %r14,%r3 /* Copy the curthread pointer */
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mr %r15,%r4 /* ... and the current pcb pointer */
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mfcr %r16 /* Save the condition register */
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stw %r16,PCB_CR(%r3)
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mflr %r16 /* Save the link register */
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stw %r16,PCB_LR(%r3)
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stw %r1,PCB_SP(%r3) /* Save the stack pointer */
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#if 0
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lwz %r29,PCB_FLAGS(%r3)
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andi. %r9, %r29, 1 /* XXX - don't hard code */
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beq .L1
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mr %r29, %r3 /* Save the PCB pointer */
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bl save_fpu
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mr %r3, %r29 /* and restore it */
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#endif
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.L1:
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bl choosethread /* Find a new thread to run */
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cmplw 0,%r3,%r15 /* Compare to curthread */
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beq .L2 /* If it's the same, we're done */
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mr %r14,%r3 /* Save off the (struct thread *) */
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mr %r16,%r3 /* Save off the (struct thread *) */
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mr %r3,%r15
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bl pmap_deactivate /* Deactivate the current pmap */
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mr %r3,%r16
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bl pmap_activate /* Activate the new address space */
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mtlr %r30
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mfsprg %r4,%r0 /* Get the pcpu pointer */
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stw %r14,PC_CURTHREAD(%r4) /* Store new current thread */
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lwz %r4,TD_PCB(%r14) /* Grab the new PCB */
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mfsprg %r4,0 /* Get the pcpu pointer */
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stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */
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lwz %r4,TD_PCB(%r16) /* Grab the new PCB */
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#if 0
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lwz %r29, PCB_FLAGS(%r4) /* Restore FPU regs if needed */
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andi. %r9, %r29, 1
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beq .L2
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mr %r29, %r4
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mr %r3, %r4
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bl enable_fpu
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mr %r4, %r29
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#endif
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.L2:
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lmw %r14,PCB_CONTEXT(%r4) /* Load the non-volatile GP regs */
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lwz %r5,PCB_CR(%r4) /* Load the condition register */
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mtcr %r5
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lwz %r5,PCB_LR(%r4) /* Load the link register */
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mtlr %r5
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lwz %r1,PCB_SP(%r4) /* Load the stack pointer */
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blr
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/*
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@ -71,45 +71,58 @@
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* Find a runnable thread and switch to it.
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*/
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ENTRY(cpu_switch)
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mflr %r30
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mfsprg %r3,%r0 /* Get the pcpu pointer */
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mfsprg %r3,0 /* Get the pcpu pointer */
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lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */
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lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */
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stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
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mfcr %r4 /* Save the condition register */
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stw %r4,PCB_CR(%r3)
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mr %r14,%r3 /* Copy the curthread pointer */
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mr %r15,%r4 /* ... and the current pcb pointer */
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mfcr %r16 /* Save the condition register */
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stw %r16,PCB_CR(%r3)
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mflr %r16 /* Save the link register */
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stw %r16,PCB_LR(%r3)
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stw %r1,PCB_SP(%r3) /* Save the stack pointer */
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#if 0
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lwz %r29,PCB_FLAGS(%r3)
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andi. %r9, %r29, 1 /* XXX - don't hard code */
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beq .L1
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mr %r29, %r3 /* Save the PCB pointer */
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bl save_fpu
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mr %r3, %r29 /* and restore it */
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#endif
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.L1:
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bl choosethread /* Find a new thread to run */
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cmplw 0,%r3,%r15 /* Compare to curthread */
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beq .L2 /* If it's the same, we're done */
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mr %r14,%r3 /* Save off the (struct thread *) */
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mr %r16,%r3 /* Save off the (struct thread *) */
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mr %r3,%r15
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bl pmap_deactivate /* Deactivate the current pmap */
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mr %r3,%r16
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bl pmap_activate /* Activate the new address space */
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mtlr %r30
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mfsprg %r4,%r0 /* Get the pcpu pointer */
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stw %r14,PC_CURTHREAD(%r4) /* Store new current thread */
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lwz %r4,TD_PCB(%r14) /* Grab the new PCB */
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mfsprg %r4,0 /* Get the pcpu pointer */
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stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */
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lwz %r4,TD_PCB(%r16) /* Grab the new PCB */
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#if 0
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lwz %r29, PCB_FLAGS(%r4) /* Restore FPU regs if needed */
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andi. %r9, %r29, 1
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beq .L2
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mr %r29, %r4
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mr %r3, %r4
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bl enable_fpu
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mr %r4, %r29
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#endif
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.L2:
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lmw %r14,PCB_CONTEXT(%r4) /* Load the non-volatile GP regs */
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lwz %r5,PCB_CR(%r4) /* Load the condition register */
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mtcr %r5
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lwz %r5,PCB_LR(%r4) /* Load the link register */
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mtlr %r5
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lwz %r1,PCB_SP(%r4) /* Load the stack pointer */
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blr
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/*
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@ -71,45 +71,58 @@
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* Find a runnable thread and switch to it.
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*/
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ENTRY(cpu_switch)
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mflr %r30
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mfsprg %r3,%r0 /* Get the pcpu pointer */
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mfsprg %r3,0 /* Get the pcpu pointer */
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lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */
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lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */
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stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
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mfcr %r4 /* Save the condition register */
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stw %r4,PCB_CR(%r3)
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mr %r14,%r3 /* Copy the curthread pointer */
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mr %r15,%r4 /* ... and the current pcb pointer */
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mfcr %r16 /* Save the condition register */
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stw %r16,PCB_CR(%r3)
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mflr %r16 /* Save the link register */
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stw %r16,PCB_LR(%r3)
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stw %r1,PCB_SP(%r3) /* Save the stack pointer */
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#if 0
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lwz %r29,PCB_FLAGS(%r3)
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andi. %r9, %r29, 1 /* XXX - don't hard code */
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beq .L1
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mr %r29, %r3 /* Save the PCB pointer */
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bl save_fpu
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mr %r3, %r29 /* and restore it */
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#endif
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.L1:
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bl choosethread /* Find a new thread to run */
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cmplw 0,%r3,%r15 /* Compare to curthread */
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beq .L2 /* If it's the same, we're done */
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mr %r14,%r3 /* Save off the (struct thread *) */
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mr %r16,%r3 /* Save off the (struct thread *) */
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mr %r3,%r15
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bl pmap_deactivate /* Deactivate the current pmap */
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mr %r3,%r16
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bl pmap_activate /* Activate the new address space */
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mtlr %r30
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mfsprg %r4,%r0 /* Get the pcpu pointer */
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stw %r14,PC_CURTHREAD(%r4) /* Store new current thread */
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lwz %r4,TD_PCB(%r14) /* Grab the new PCB */
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mfsprg %r4,0 /* Get the pcpu pointer */
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stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */
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lwz %r4,TD_PCB(%r16) /* Grab the new PCB */
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#if 0
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lwz %r29, PCB_FLAGS(%r4) /* Restore FPU regs if needed */
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andi. %r9, %r29, 1
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beq .L2
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mr %r29, %r4
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mr %r3, %r4
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bl enable_fpu
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mr %r4, %r29
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#endif
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.L2:
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lmw %r14,PCB_CONTEXT(%r4) /* Load the non-volatile GP regs */
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lwz %r5,PCB_CR(%r4) /* Load the condition register */
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mtcr %r5
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lwz %r5,PCB_LR(%r4) /* Load the link register */
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mtlr %r5
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lwz %r1,PCB_SP(%r4) /* Load the stack pointer */
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blr
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/*
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