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[POWERPC] 40x MMU

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Add MMU definitions for 40x platforms.  Also fixes two warnings in 40x_mmu.c.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Josh Boyer 2007-08-20 07:28:48 -05:00
parent e90f3b74d8
commit 4d922c8dc3
4 changed files with 71 additions and 3 deletions
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2
arch/powerpc/kernel/head_40x.S
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@ -772,7 +772,7 @@ finish_tlb_load:
*/
lwz r9, tlb_4xx_index@l(0)
addi r9, r9, 1
andi. r9, r9, (PPC4XX_TLB_SIZE-1)
andi. r9, r9, (PPC40X_TLB_SIZE-1)
stw r9, tlb_4xx_index@l(0)
6:

4
arch/powerpc/mm/40x_mmu.c
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@ -108,7 +108,7 @@ unsigned long __init mmu_mapin_ram(void)
pmd_t *pmdp;
unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE;
pmdp = pmd_offset(pgd_offset_k(v), v);
pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v);
pmd_val(*pmdp++) = val;
pmd_val(*pmdp++) = val;
pmd_val(*pmdp++) = val;
@ -123,7 +123,7 @@ unsigned long __init mmu_mapin_ram(void)
pmd_t *pmdp;
unsigned long val = p | _PMD_SIZE_4M | _PAGE_HWEXEC | _PAGE_HWWRITE;
pmdp = pmd_offset(pgd_offset_k(v), v);
pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v);
pmd_val(*pmdp) = val;
v += LARGE_PAGE_SIZE_4M;

65
include/asm-powerpc/mmu-40x.h Normal file
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@ -0,0 +1,65 @@
#ifndef _ASM_POWERPC_MMU_40X_H_
#define _ASM_POWERPC_MMU_40X_H_
/*
* PPC40x support
*/
#define PPC40X_TLB_SIZE 64
/*
* TLB entries are defined by a "high" tag portion and a "low" data
* portion. On all architectures, the data portion is 32-bits.
*
* TLB entries are managed entirely under software control by reading,
* writing, and searchoing using the 4xx-specific tlbre, tlbwr, and tlbsx
* instructions.
*/
#define TLB_LO 1
#define TLB_HI 0
#define TLB_DATA TLB_LO
#define TLB_TAG TLB_HI
/* Tag portion */
#define TLB_EPN_MASK 0xFFFFFC00 /* Effective Page Number */
#define TLB_PAGESZ_MASK 0x00000380
#define TLB_PAGESZ(x) (((x) & 0x7) << 7)
#define PAGESZ_1K 0
#define PAGESZ_4K 1
#define PAGESZ_16K 2
#define PAGESZ_64K 3
#define PAGESZ_256K 4
#define PAGESZ_1M 5
#define PAGESZ_4M 6
#define PAGESZ_16M 7
#define TLB_VALID 0x00000040 /* Entry is valid */
/* Data portion */
#define TLB_RPN_MASK 0xFFFFFC00 /* Real Page Number */
#define TLB_PERM_MASK 0x00000300
#define TLB_EX 0x00000200 /* Instruction execution allowed */
#define TLB_WR 0x00000100 /* Writes permitted */
#define TLB_ZSEL_MASK 0x000000F0
#define TLB_ZSEL(x) (((x) & 0xF) << 4)
#define TLB_ATTR_MASK 0x0000000F
#define TLB_W 0x00000008 /* Caching is write-through */
#define TLB_I 0x00000004 /* Caching is inhibited */
#define TLB_M 0x00000002 /* Memory is coherent */
#define TLB_G 0x00000001 /* Memory is guarded from prefetch */
#ifndef __ASSEMBLY__
typedef unsigned long phys_addr_t;
typedef struct {
unsigned long id;
unsigned long vdso_base;
} mm_context_t;
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_POWERPC_MMU_40X_H_ */

3
include/asm-powerpc/mmu.h
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@ -8,6 +8,9 @@
#elif defined(CONFIG_PPC_STD_MMU)
/* 32-bit classic hash table MMU */
# include <asm/mmu-hash32.h>
#elif defined(CONFIG_40x)
/* 40x-style software loaded TLB */
# include <asm/mmu-40x.h>
#elif defined(CONFIG_44x)
/* 44x-style software loaded TLB */
# include <asm/mmu-44x.h>