948486abe3
- Discard large amounts of BIOS-related code in favour of the more compact BTX vm86 interface. - Build the loader module as ELF, although the resulting object is a.out, make gensetdefs 32/64-bit sensitive and use a single copy of it. - Throw away installboot, as it's no longer required. - Use direct bcopy operations in the i386_copy module, as BTX maps the first 16M of memory. Check operations against the detected size of actual memory.
63 lines
1019 B
C
63 lines
1019 B
C
/*
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* mjs copyright
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*/
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/*
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* MD primitives supporting placement of module data
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*
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* XXX should check load address/size against memory top.
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*/
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#include <stand.h>
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#include "libi386.h"
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#include "btxv86.h"
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#define READIN_BUF 4096
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int
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i386_copyin(void *src, vm_offset_t dest, size_t len)
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{
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if (dest + len >= memtop)
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return(0);
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bcopy(src, PTOV(dest), len);
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return(len);
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}
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int
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i386_copyout(vm_offset_t src, void *dest, size_t len)
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{
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if (src + len >= memtop)
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return(0);
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bcopy(PTOV(src), dest, len);
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return(len);
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}
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int
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i386_readin(int fd, vm_offset_t dest, size_t len)
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{
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void *buf;
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size_t resid, chunk, get, got;
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if (dest + len >= memtop)
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return(0);
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chunk = min(READIN_BUF, len);
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buf = malloc(chunk);
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if (buf == NULL)
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return(0);
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for (resid = len; resid > 0; resid -= got, dest += got) {
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get = min(chunk, resid);
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got = read(fd, buf, get);
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if (got <= 0)
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break;
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bcopy(buf, PTOV(dest), chunk);
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}
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free(buf);
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return(len - resid);
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}
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