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/* Project:     OSLib
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 * Description: The OS Construction Kit
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 * Date:                1.6.2000
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 * Idea by:             Luca Abeni & Gerardo Lamastra
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 *
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 * OSLib is an SO project aimed at developing a common, easy-to-use
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 * low-level infrastructure for developing OS kernels and Embedded
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 * Applications; it partially derives from the HARTIK project but it
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 * currently is independently developed.
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 *
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 * OSLib is distributed under GPL License, and some of its code has
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 * been derived from the Linux kernel source; also some important
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 * ideas come from studying the DJGPP go32 extender.
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 *
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 * We acknowledge the Linux Community, Free Software Foundation,
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 * D.J. Delorie and all the other developers who believe in the
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 * freedom of software and ideas.
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 *
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 * For legalese, check out the included GPL license.
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 */
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/*      Routines to create address spaces and bind physical memory to them */
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#include <ll/sys/ll/ll-data.h>
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#include <ll/sys/ll/aspace.h>
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FILE(Address-Space);
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struct as AS_table[ASMax];
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void as_init(void)
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{
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        int i;
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        for (i = 0; i < ASMax; i++) {
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                AS_table[i].status = AS_FREE;
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        }
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}
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AS as_create(void)
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{
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        int i;
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        i = 0;
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        while((i < ASMax) && (AS_table[i].status & AS_BUSY)) {
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                i++;
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        }
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        if (i == ASMax) {
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                return 0;
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        }
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        AS_table[i].status = AS_BUSY;   /* Empty address space... */
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        AS_table[i].base = 0;
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        AS_table[i].limit= 0;
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        GDT_place(ASindex2sel(i), AS_table[i].base, AS_table[i].limit,
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                        DATA_ACCESS, GRAN_32B);
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        GDT_place(ASindex2sel(i) + 8, AS_table[i].base, AS_table[i].limit,
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                        CODE_ACCESS, GRAN_32B);
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/* We also need a code segment... */
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        return ASindex2sel(i);
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}
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int as_bind(AS as, DWORD ph_addr, DWORD l_addr, DWORD size)
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{
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        int i = ASsel2index(as);
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        /* We have not paging... So l_addr must be 0 */
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        if (l_addr != 0)
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                return -1;
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        AS_table[i].base = ph_addr;
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        AS_table[i].limit= size;
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        GDT_place(as, AS_table[i].base, AS_table[i].limit,
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                        DATA_ACCESS, GRAN_32B);
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        GDT_place(as + 8, AS_table[i].base, AS_table[i].limit,
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                        CODE_ACCESS, GRAN_32B);
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/* We also need a code segment... */
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        return 1;
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}