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vmem11
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vmem_prg
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vm_save.c
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C/C++ Source or Header
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1990-10-02
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2KB
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86 lines
#include "vmem.h"
/****************************************************/
/* Speichern eines Bereiches in den virt. Speicher: */
/****************************************************/
long vm_save (source, destination, count)
char *source;
V_ADR destination;
long count;
{
BYTE *page_ptr;
VPAGE vmempage;
WORD start_offset;
long entry_size;
vmempage = GET_PAGE (destination);
start_offset = GET_OFFSET (destination);
#ifdef DEBUG
printf ("VM_SAVE: 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 = info.page_size - start_offset;
page_ptr = load_page (vmempage++, CACHE_WRITE) + start_offset;
if (count <= size)
{
memcpy (page_ptr, source, count);
return (count);
}
else
{
memcpy (page_ptr, source, size);
source += size;
entry_size -= size;
}
}
if (entry_size >= info.page_size)
{
WORD wcount;
long size;
start_offset = GET_PAGE (entry_size);
cache_clr (0, MIN (start_offset, info.cache_count));
while (start_offset > 0)
{
wcount = MIN (start_offset, info.cache_count);
size = PAGE_TO_ADDR (wcount);
memcopy (cache, source, size);
write_sequence (0, wcount, vmempage);
source += size;
entry_size -= size;
vmempage += wcount;
start_offset -= wcount;
}
}
if (entry_size > 0)
{
page_ptr = load_page (vmempage, CACHE_WRITE);
memcpy (page_ptr, source, entry_size);
}
return (count);
}