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/*
** bootstrap.h -- This file is a part of the Atari bootloader.
**
** Copyright 1993 by Arjan Knor
**
** Modified by Andreas Schwab
** - clear transparent translation registers
** Modified 18-Aug-96 by Geert Uytterhoeven
** - Updated for the new boot information structure (untested!)
** Modified 1996-11-12 by Andreas Schwab
** - Fixed and tested previous change
**
** This file is subject to the terms and conditions of the GNU General Public
** License. See the file COPYING in the main directory of this archive
** for more details.
**
*/
#ifndef BOOTSTRAP_H
#define BOOTSTRAP_H
/*
* Atari Bootinfo Definitions
*
* All limits herein are `soft' limits, i.e. they don't put constraints
* on the actual parameters in the kernel.
*/
struct atari_bootinfo {
unsigned long machtype; /* machine type */
unsigned long cputype; /* system CPU */
unsigned long fputype; /* system FPU */
unsigned long mmutype; /* system MMU */
int num_memory; /* # of memory blocks found */
struct mem_info memory[NUM_MEMINFO]; /* memory description */
struct mem_info ramdisk; /* ramdisk description */
char command_line[CL_SIZE]; /* kernel command line parameters */
unsigned long mch_cookie; /* _MCH cookie from TOS */
};
/* _MCH cookie values */
#define MACH_ST 0
#define MACH_STE 1
#define MACH_TT 2
#define MACH_FALCON 3
/* some constants for memory handling */
#define ST_RAM 0
#define TT_RAM 1
#define TT_RAM_BASE (u_long)(0x01000000)
#define MB (1024 * 1024)
#define START_MEM (bi.memory[0].addr)
#define MEM_SIZE (bi.memory[0].size)
/* the various CPU- and FPU-types */
#define AFF_68000 (1)
#define AFF_68020 (2)
#define AFF_68030 (4)
#define AFF_68040 (8)
#define AFF_68881 (16)
#define AFF_68882 (32)
/* the possible OS-languages */
#define USA 0
#define FRG 1
#define FRA 2
#define UK 3
#define SPA 4
#define ITA 5
#define SWE 6
#define SWF 7
#define SWG 8
#define TUR 9
#define FIN 10
#define NOR 11
#define DEN 12
#define SAU 13
#define HOL 14
/* some inline functions */
static __inline int fpu_idle_frame_size (void)
{
char fpu_frame[216];
__asm__ __volatile__ ("fnop"::);
__asm__ __volatile__ ("fsave %0@" : : "a" (fpu_frame));
return fpu_frame[1];
}
static __inline void change_stack (u_long *stackp)
{
__asm__ volatile ("movel %0,sp\n\t" :: "g" (stackp) : "sp");
}
static __inline void disable_interrupts (void)
{
__asm__ volatile ("orw #0x700,sr":);
}
extern struct atari_bootinfo bi;
static __inline void disable_cache (void)
{
__asm__ volatile ("movec %0,cacr" :: "d" (0));
if (bi.cputype & CPU_68060) {
/* '060: clear branch cache after disabling it;
* disable superscalar operation (and enable FPU) */
__asm__ volatile ("movec %0,cacr" :: "d" (0x00400000));
__asm__ volatile ("moveq #0,d0;"
".long 0x4e7b0808" /* movec d0,pcr */
: /* no outputs */
: /* no inputs */
: "d0");
}
}
static __inline void disable_mmu (void)
{
if (bi.cputype & (CPU_68040|CPU_68060)) {
__asm__ volatile ("moveq #0,d0;"
".long 0x4e7b0003;" /* movec d0,tc */
".long 0x4e7b0004;" /* movec d0,itt0 */
".long 0x4e7b0005;" /* movec d0,itt1 */
".long 0x4e7b0006;" /* movec d0,dtt0 */
".long 0x4e7b0007" /* movec d0,dtt1 */
: /* no outputs */
: /* no inputs */
: "d0");
}
else {
__asm__ volatile ("subl #4,sp\n\t"
"pmove tc,sp@\n\t"
"bclr #7,sp@\n\t"
"pmove sp@,tc\n\t"
"addl #4,sp");
if (bi.cputype & CPU_68030) {
__asm__ volatile ("clrl sp@-\n\t"
".long 0xf0170800\n\t" /* pmove sp@,tt0 */
".long 0xf0170c00\n\t" /* pmove sp@,tt1 */
"addl #4,sp\n");
}
}
}
static __inline void jump_to_mover (void *, void *, void *, void *, int, int,
void *) __attribute__ ((noreturn));
static __inline void jump_to_mover (void *kernel_start, void *mem_start,
void *ramdisk_end, void *mem_end,
int kernel_size, int ramdisk_size,
void *mover_addr)
{
asm volatile ("movel %0,a0\n\t"
"movel %1,a1\n\t"
"movel %2,a2\n\t"
"movel %3,a3\n\t"
"movel %4,d0\n\t"
"movel %5,d1\n\t"
"jmp %6@\n"
: /* no outputs */
: "g" (kernel_start), "g" (mem_start),
"g" (ramdisk_end), "g" (mem_end),
"g" (kernel_size), "g" (ramdisk_size),
"a" (mover_addr)
: "a0", "a1", "a2", "a3", "d0", "d1");
/* Avoid warning that function may return */
for (;;) ;
}
#endif /* BOOTSTRAP_H */
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