forked from M-Labs/artiq
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
#include <stdlib.h>
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#include <system.h>
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#include <spr-defs.h>
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#include <hw/common.h>
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#include <generated/mem.h>
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#include "mailbox.h"
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#define KERNELCPU_MAILBOX MMPTR(MAILBOX_BASE)
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static unsigned int last_transmission;
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static void _flush_cpu_dcache(void)
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{
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unsigned long dccfgr;
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unsigned long cache_set_size;
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unsigned long cache_ways;
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unsigned long cache_block_size;
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unsigned long cache_size;
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int i;
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dccfgr = mfspr(SPR_DCCFGR);
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cache_ways = 1 << (dccfgr & SPR_ICCFGR_NCW);
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cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
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cache_block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
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cache_size = cache_set_size * cache_ways * cache_block_size;
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for (i = 0; i < cache_size; i += cache_block_size)
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mtspr(SPR_DCBIR, i);
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}
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void mailbox_send(void *ptr)
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{
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last_transmission = (unsigned int)ptr;
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KERNELCPU_MAILBOX = last_transmission;
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}
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int mailbox_acknowledged(void)
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{
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unsigned int m;
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m = KERNELCPU_MAILBOX;
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return !m || (m != last_transmission);
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}
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void mailbox_send_and_wait(void *ptr)
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{
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mailbox_send(ptr);
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while(!mailbox_acknowledged());
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}
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void *mailbox_receive(void)
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{
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unsigned int r;
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r = KERNELCPU_MAILBOX;
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if(r == last_transmission)
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return NULL;
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else {
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if(r) {
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_flush_cpu_dcache();
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}
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return (void *)r;
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}
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}
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void *mailbox_wait_and_receive(void)
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{
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void *r;
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while(!(r = mailbox_receive()));
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return r;
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}
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void mailbox_acknowledge(void)
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{
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KERNELCPU_MAILBOX = 0;
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}
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