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/* Loading routines for 680 project.
*
* Includes splash screen, choose-an-image, etc.
*
* Copyright 2010, Duncan Smith
* GPL
*/
#include <tigcclib.h>
#include "asm_vars.h"
HANDLE page_handles[256];
char infloop[16] = { 0xc3, 0, 0, 0 };
void init_load(void);
void *deref_page(int);
void close_pages(void);
void init_load(void)
{
int i;
pages = malloc(256 * sizeof(void*));
/* Page layout:
* 0x40 RAM
* 0x41 RAM
*
* 0x00 ROM
* ... all the way to ...
* 0x1f ROM
*/
for (i = 0 ; i <= 255; i++)
page_handles[i] = 0;
i = 0;
// RAM pages
pages[0x40] = deref_page(0x40);
pages[0x41] = deref_page(0x41);
if (pages[0x40] == NULL)
pages[0x40] = malloc(PAGE_SIZE * sizeof(char));
if (pages[0x41] == NULL)
pages[0x41] = malloc(PAGE_SIZE * sizeof(char));
// ROM pages
for (i = 0; i <= 0x1f; i++) {
pages[i] = deref_page(i);
if (pages[i] == NULL)
pages[i] = pages[0x40];
}
mem_page_0 = pages[0];
mem_page_loc_0 = 0;
mem_page_1 = pages[0x1f];
mem_page_loc_1 = 0x1f;
mem_page_2 = pages[0];
mem_page_loc_2 = 0;
mem_page_3 = pages[0x40];
mem_page_loc_3 = 0x40;
return;
}
/* Turns a page number into a pointer to a page. Returns NULL if not
* found, throws an error in other cases.
*/
void *deref_page(int number)
{
/* Bits of code here stolen from MulTI */
char page_name[8];
HSYM hsym;
HANDLE fhandle;
char *fdata;
int fsize;
sprintf(&page_name, "pg_%02x", number);
hsym = SymFind(SYMSTR(page_name));
if(hsym.folder == 0)
return NULL;
fhandle = DerefSym(hsym)->handle;
fdata = HLock(fhandle);
if(fdata == NULL)
throw_error("Couldn't lock page");
page_handles[number] = fhandle;
/* read size */
fsize = *(WORD *)fdata;
fdata += 2;
/* check type */
if((fdata[fsize - 1] != OTH_TAG) || strcmp(&fdata[fsize - 6], "83p")) {
close_pages();
throw_error("Not a 680 file");
}
return fdata;
}
void close_pages(void)
{
int i;
for (i = 0; i < 256; i++)
if (page_handles[i] != 0)
HeapUnlock(page_handles[i]);
}
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