mirror of
https://github.com/openhwgroup/cvw
synced 2025-02-11 06:05:49 +00:00
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
#pragma once
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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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// The maximum number of HARTs this code supports
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#define CLINT_CTRL_ADDR 0x2000000
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#ifndef MAX_HARTS
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#define MAX_HARTS 256
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#endif
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#define CLINT_END_HART_IPI CLINT_CTRL_ADDR + (MAX_HARTS * 4)
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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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li reg1, NONSMP_HART; \
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csrr reg2, mhartid; \
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bne reg1, 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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