/*------------------------------------------------------------------------
* setsegs - initialize the 386 processor
*------------------------------------------------------------------------
*/
setsegs()
{
extern int start, etext;
struct sd *psd;
unsigned int np, npages;
npages = sizmem();
maxaddr = (char *)(npages * NBPG - 1);
psd = &gdt_copy[1]; /* kernel code segment */
np = ((int)&etext + NBPG-1) / NBPG; /* # code pages */
psd->sd_lolimit = np;
psd->sd_hilimit = np >> 16;
psd = &gdt_copy[2]; /* kernel data segment */
psd->sd_lolimit = npages;
psd->sd_hilimit = npages >> 16;
psd = &gdt_copy[3]; /* kernel stack segment */
psd->sd_lolimit = npages;
psd->sd_hilimit = npages >> 16;
memcpy(gdt, gdt_copy, sizeof(gdt_copy));
initsp = npages*NBPG - 4;
}
/*------------------------------------------------------------------------
* setsegs - initialize the 386 processor
*------------------------------------------------------------------------
*/
setsegs()
{
extern int start, etext;
struct sd *psd;
unsigned int np, npages, lostk, limit;
npages = sizmem();
/*
maxaddr = (char *)(npages * NBPG - 1);
*/
//maxaddr = (char *)( 1536 * NBPG - 1); /* 10M size */
/* the top 10M is used for backing store */
// new max address 1024 pages: 0x0400000-1
maxaddr = (char *)( 1024 * 4096 - 1); /* 4M size */
psd = &gdt_copy[1]; /* kernel code segment */
np = ((int)&etext + NBPG-1) / NBPG; /* # code pages */
psd->sd_lolimit = np;
psd->sd_hilimit = np >> 16;
#if 0
psd = &gdt_copy[2]; /* kernel data segment */
psd->sd_lolimit = npages;
psd->sd_hilimit = npages >> 16;
psd = &gdt_copy[3]; /* kernel stack segment */
psd->sd_lolimit = npages;
psd->sd_hilimit = npages >> 16;
#endif
psd = &gdt_copy[4]; /* bootp code segment */
psd->sd_lolimit = npages; /* Allows execution of 0x100000 CODE */
psd->sd_hilimit = npages >> 16;
/* Set the descriptors for the tasks */
/* Main Xinu task */
psd = &gdt_copy[5];
psd->sd_hibase = ((unsigned int) i386_tasks) >> 24;
psd->sd_midbase = (((unsigned int) i386_tasks)>>16) & 0xff;
psd->sd_lobase = ((unsigned int) i386_tasks) & 0xffff;
/* Page Fault handler task */
psd = &gdt_copy[6];
psd->sd_hibase = ((unsigned int) & i386_tasks[1]) >> 24;
psd->sd_midbase = (((unsigned int) & i386_tasks[1]) >> 16) & 0xff;
psd->sd_lobase = ((unsigned int) & i386_tasks[1]) & 0xffff;
blkcopy(gdt, gdt_copy, sizeof(gdt_copy));
/* initial stack must be in physical
memory.
*/
/*
initsp = npages*NBPG - 4;
*/
initsp = 1024*NBPG - 4;
}
