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Diffstat (limited to 'bsps/powerpc/include/libcpu/bat.h')
-rw-r--r-- | bsps/powerpc/include/libcpu/bat.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/bsps/powerpc/include/libcpu/bat.h b/bsps/powerpc/include/libcpu/bat.h new file mode 100644 index 0000000000..2a27e810ee --- /dev/null +++ b/bsps/powerpc/include/libcpu/bat.h @@ -0,0 +1,85 @@ +/* + * bat.h + * + * This file contains declaration of C function to + * Instantiate 60x/7xx ppc Block Address Translation (BAT) registers. + * More detailed information can be found on motorola + * site and more precisely in the following book : + * + * MPC750 + * Risc Microporcessor User's Manual + * Motorola REF : MPC750UM/AD 8/97 + * + * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) + * Canon Centre Recherche France. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#ifndef _LIBCPU_BAT_H +#define _LIBCPU_BAT_H + +#include <libcpu/mmu.h> +#include <libcpu/pgtable.h> + +#define IO_PAGE (_PAGE_NO_CACHE | _PAGE_GUARDED | _PAGE_RW) + +#ifndef ASM +/* Take no risks -- the essential parts of this routine run with + * interrupts disabled! + * + * The routine does basic parameter checks: + * - Index must be 0..3 (0..7 on 7455, 7457). + * If an index > 3 is requested the 745x is + * programmed to enable the higher BATs. + * - Size must be a power of two and <= 1<<28 + * (<=1<<31 on 7455, 7457. Also, on these processors + * the special value 0xffffffff is allowed which stands + * for 1<<32). + * If a size > 1<<28 is requested, the 745x is + * programmed to enable the larger block sizes. + * - Bat ranges must not overlap. + * - Physical & virtual addresses must be aligned + * to the size. + * + * RETURNS: zero on success, nonzero on failure. + */ +extern int setdbat(int bat_index, unsigned long virt, unsigned long phys, + unsigned int size, int flags); + +/* Same as setdbat but sets IBAT */ +extern int setibat(int bat_index, unsigned long virt, unsigned long phys, + unsigned int size, int flags); + +/* read DBAT # 'idx' into *pu / *pl. NULL pointers may be passed. + * If pu and pl are NULL, the bat contents are dumped to the console (printk). + * + * RETURNS: upper BAT contents or (-1) if index is invalid + */ +extern int getdbat(int bat_index, unsigned long *pu, unsigned long *pl); + +/* Same as getdbat but reads IBAT */ +extern int getibat(int bat_index, unsigned long *pu, unsigned long *pl); + +/* Do not use the asm-routines; they are obsolete; use setdbat() instead */ +extern void asm_setdbat0(unsigned int uperPart, unsigned int lowerPart); +extern void asm_setdbat1(unsigned int uperPart, unsigned int lowerPart); +extern void asm_setdbat2(unsigned int uperPart, unsigned int lowerPart); +extern void asm_setdbat3(unsigned int uperPart, unsigned int lowerPart); +#else + +/* Initialize all bats (upper and lower) to zero. This routine should *only* + * be called during early BSP initialization when no C-ABI is available + * yet. + * This routine clobbers r3 and r4. + * NOTE: on 7450 CPUs all 8 dbat/ibat units are cleared. On 601 CPUs only + * 4 ibats. + */ + .globl CPU_clear_bats_early + .type CPU_clear_bats_early,@function + +#endif + +#endif /* _LIBCPU_BAT_H */ |