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vmem11
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vmem_prg
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vm_load.c
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C/C++ Source or Header
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1990-10-03
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2KB
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88 lines
#include "vmem.h"
/*********************************************************/
/* Laden eines Speicherbereiches aus dem virt. Speicher: */
/*********************************************************/
long vm_load (source, destination, count)
V_ADR source;
char *destination;
long count;
{
BYTE *page_ptr;
VPAGE vmempage;
WORD start_offset;
long entry_size;
vmempage = GET_PAGE (source);
start_offset = GET_OFFSET (source);
#ifdef DEBUG
printf ("VM_LOAD: page: %x offset: %x\n", vmempage, start_offset);
#endif
if ((vmempage >= info.count_page) || (flags [vmempage] == FREE))
return (ILLEGAL_ADDRESS);
if ((count == 0) || (count < -1))
return (ILLEGAL_COUNT);
entry_size = PAGE_TO_ADDR (MD_COUNT (md_find (vmempage)));
if (count == -1)
count = entry_size - start_offset;
else
entry_size = count = MIN (count, (entry_size - start_offset));
if (start_offset > 0)
{
long size;
size = info.page_size - start_offset;
page_ptr = load_page (vmempage++, CACHE_READ) + start_offset;
if (count <= size)
{
memcpy (destination, page_ptr, count);
return (count);
}
else
{
memcpy (destination, page_ptr, size);
destination += size;
entry_size -= size;
}
}
if (entry_size >= info.page_size)
{
WORD rcount;
long size;
start_offset = GET_PAGE (entry_size);
cache_clr (0, MIN (start_offset, info.cache_count));
while (start_offset > 0)
{
rcount = MIN (start_offset, info.cache_count);
size = PAGE_TO_ADDR (rcount);
read_sequence (0, rcount, vmempage);
memcopy (destination, cache, size);
destination += size;
entry_size -= size;
vmempage += rcount;
start_offset -= rcount;
}
}
if (entry_size > 0)
{
page_ptr = load_page (vmempage, CACHE_READ);
memcpy (destination, page_ptr, entry_size);
}
return (count);
}