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Differential D38314 Diff 116420 stand/kboot/main.c

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stand/kboot/main.c

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#define SEGALIGN (1ul<<20) #define SEGALIGN (1ul<<20)
static ssize_t static ssize_t
get_phys_buffer(vm_offset_t dest, const size_t len, void **buf) get_phys_buffer(vm_offset_t dest, const size_t len, void **buf)
{ {
int i = 0; int i = 0;
const size_t segsize = 64*1024*1024; const size_t segsize = 64*1024*1024;
size_t sz;
if (nkexec_segments == HOST_KEXEC_SEGMENT_MAX) if (nkexec_segments == HOST_KEXEC_SEGMENT_MAX)
panic("Tried to load too many kexec segments"); panic("Tried to load too many kexec segments");
for (i = 0; i < nkexec_segments; i++) { for (i = 0; i < nkexec_segments; i++) {
if (dest >= (vm_offset_t)loaded_segments[i].mem && if (dest >= (vm_offset_t)loaded_segments[i].mem &&
dest < (vm_offset_t)loaded_segments[i].mem + dest < (vm_offset_t)loaded_segments[i].mem +
loaded_segments[i].memsz) loaded_segments[i].memsz)
goto out; goto out;
} }
loaded_segments[nkexec_segments].buf = host_getmem(segsize); sz = segsize;
loaded_segments[nkexec_segments].bufsz = segsize; if (nkexec_segments == 0) {
/* how much space does this segment have */
sz = space_avail(dest);
/* Clip to 45% of available memory (need 2 copies) */
sz = min(sz, rounddown2(mem_avail * 45 / 100, SEGALIGN));
/* And only use 95% of what we can allocate */
sz = min(sz, rounddown2(
(commit_limit - committed_as) * 95 / 100, SEGALIGN));
printf("Allocating %zd MB for first segment\n", sz >> 20);
}
loaded_segments[nkexec_segments].buf = host_getmem(sz);
loaded_segments[nkexec_segments].bufsz = sz;
loaded_segments[nkexec_segments].mem = (void *)rounddown2(dest,SEGALIGN); loaded_segments[nkexec_segments].mem = (void *)rounddown2(dest,SEGALIGN);
loaded_segments[nkexec_segments].memsz = segsize; loaded_segments[nkexec_segments].memsz = sz;
i = nkexec_segments; i = nkexec_segments;
nkexec_segments++; nkexec_segments++;
out: out:
*buf = loaded_segments[i].buf + (dest - *buf = loaded_segments[i].buf + (dest -
(vm_offset_t)loaded_segments[i].mem); (vm_offset_t)loaded_segments[i].mem);
return (min(len,loaded_segments[i].bufsz - (dest - return (min(len,loaded_segments[i].bufsz - (dest -
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