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Import backup from 2003-09-03

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This commit is contained in:
Josh Holtrop 2003-09-03 22:00:00 -04:00
parent 5ffee3c2d8
commit e147635333
2 changed files with 47 additions and 8 deletions
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36
kernel.c
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@ -19,7 +19,10 @@ void k_init();
#include "video.c"
dword timer = 0;
dword pagesa = 0;
word index = 0;
dword ptrs[512];
dword goon = 1;
dword req = 0;
void k_init()
{
@ -28,9 +31,12 @@ void k_init()
outportb(0x43, 0x34);
outportb(0x40, 0x9c); //lsb
outportb(0x40, 0x2e); //msb
enable_ints();
video_init((ModeInfoBlock *) 0x90306);
// video_init((ModeInfoBlock *) 0x90306);
mm_init();
int a;
for (a=0; a<512; a++)
ptrs[a] = 0;
enable_ints();
console_cls();
printf("Memory available to OS: %d MB", mm_totalmem/0x100000);
/* pageblock *pb = first_pageblock;
@ -51,8 +57,28 @@ void isr(dword num)
(*(byte *)0xb8000)++;
if ((timer%50)==0)
{
printf("\nReq: 0x%x\t Addr: 0x%x\tEntries: 0x%x\tMem: 0x%x", pagesa, (dword)mm_palloc(1024), mm_freeentries(), mm_freemem());
pagesa++;
if (goon)
{
if(ptrs[index] = (dword)mm_palloc(1024))
printf("\nReq:%d\tAddr: %x\tEntries: %x\tMem: %x\tIndex: %x", req++, ptrs[index++], mm_freeentries(), mm_freemem(), index);
else
{
goon = 0;
index = 0;
}
}
else
{
dword reslt = mm_pfree((void *)ptrs[index]); //zero returned means chunk freed successfully
printf("\nReq:%d\tFree(): %x\tEntries: %x\tMem: %x\tIndex: %x", req++, reslt, mm_freeentries(), mm_freemem(), index++);
if (reslt)
{
for (index=0; index<512; index++)
ptrs[index] = 0;
index = 0;
goon = 1;
}
}
}
eoi();
}

19
mm.c
View File

@ -157,14 +157,27 @@ int mm_pfree(void *ptr)
dword tofree = (dword) ptr;
for (;;)
{
if (pb->base == tofree)
if ((pb->base == tofree) && (pb->flags == MM_PB_USED))
{
pb->flags = MM_PB_AVAIL; //found block, mark available / coalesce it
pageblock *pbc = first_pageblock;
for (;;)
{
if ((pbc->base + (pbc->length * 4096)) == pb->base) //pbc ends where pb starts
{
pbc->length += pb->length; //extend pbc's length by pb's length
pb->flags = MM_PB_NP; //mark pb as an unused entry
return 0;
}
if ((pb->base + (pb->length * 4096)) == pbc->base) //pb ends where pb starts
{
pb->length += pbc->length;
pbc->flags = MM_PB_NP;
return 0;
}
if (pbc->link == 0) //no entry found to consolidate...
return 0;
pbc = (pageblock *) pbc->link; //next entry to test
}
}
if (pb->link == 0)