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