66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
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#ifndef SIFIVE_SMP
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#define SIFIVE_SMP
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// The maximum number of HARTs this code supports
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#ifndef MAX_HARTS
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#define MAX_HARTS 32
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#endif
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#define CLINT_END_HART_IPI CLINT_CTRL_ADDR + (MAX_HARTS*4)
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// The hart that non-SMP tests should run on
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#ifndef NONSMP_HART
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#define NONSMP_HART 0
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#endif
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/* If your test cannot handle multiple-threads, use this:
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* smp_disable(reg1)
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*/
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#define smp_disable(reg1, reg2) \
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csrr reg1, mhartid ;\
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li reg2, NONSMP_HART ;\
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beq reg1, reg2, hart0_entry ;\
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42: ;\
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wfi ;\
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j 42b ;\
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hart0_entry:
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/* If your test needs to temporarily block multiple-threads, do this:
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* smp_pause(reg1, reg2)
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* ... single-threaded work ...
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* smp_resume(reg1, reg2)
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* ... multi-threaded work ...
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*/
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#define smp_pause(reg1, reg2) \
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li reg2, 0x8 ;\
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csrw mie, reg2 ;\
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csrr reg2, mhartid ;\
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bnez reg2, 42f
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#define smp_resume(reg1, reg2) \
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li reg1, CLINT_CTRL_ADDR ;\
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41: ;\
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li reg2, 1 ;\
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sw reg2, 0(reg1) ;\
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addi reg1, reg1, 4 ;\
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li reg2, CLINT_END_HART_IPI ;\
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blt reg1, reg2, 41b ;\
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42: ;\
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wfi ;\
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csrr reg2, mip ;\
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andi reg2, reg2, 0x8 ;\
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beqz reg2, 42b ;\
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li reg1, CLINT_CTRL_ADDR ;\
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csrr reg2, mhartid ;\
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slli reg2, reg2, 2 ;\
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add reg2, reg2, reg1 ;\
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sw zero, 0(reg2) ;\
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41: ;\
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lw reg2, 0(reg1) ;\
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bnez reg2, 41b ;\
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addi reg1, reg1, 4 ;\
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li reg2, CLINT_END_HART_IPI ;\
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blt reg1, reg2, 41b
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#endif
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