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[PATCH] powerpc: generalize PPC44x_PIN_SIZE 

The following patch generalizes PPC44x_PIN_SIZE by changing it to
PPC_PIN_SIZE, which can be defined by any sub-arch to automatically adjust
VMALLOC_START.

Define PPC_PIN_SIZE on 8xx, avoiding potential conflicts with the
pinned space.

Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Marcelo Tosatti 2006-01-17 00:24:42 -02:00 committed by Paul Mackerras
parent f4fc4a5b74
commit 0ec57e53c9
4 changed files with 8 additions and 6 deletions
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4
arch/ppc/mm/44x_mmu.c
View File

@ -104,7 +104,7 @@ unsigned long __init mmu_mapin_ram(void)
/* Determine number of entries necessary to cover lowmem */
pinned_tlbs = (unsigned int)
(_ALIGN(total_lowmem, PPC44x_PIN_SIZE) >> PPC44x_PIN_SHIFT);
(_ALIGN(total_lowmem, PPC_PIN_SIZE) >> PPC44x_PIN_SHIFT);
/* Write upper watermark to save location */
tlb_44x_hwater = PPC44x_LOW_SLOT - pinned_tlbs;
@ -112,7 +112,7 @@ unsigned long __init mmu_mapin_ram(void)
/* If necessary, set additional pinned TLBs */
if (pinned_tlbs > 1)
for (i = (PPC44x_LOW_SLOT-(pinned_tlbs-1)); i < PPC44x_LOW_SLOT; i++) {
unsigned int phys_addr = (PPC44x_LOW_SLOT-i) * PPC44x_PIN_SIZE;
unsigned int phys_addr = (PPC44x_LOW_SLOT-i) * PPC_PIN_SIZE;
ppc44x_pin_tlb(i, phys_addr+PAGE_OFFSET, phys_addr);
}

2
include/asm-ppc/ibm44x.h
View File

@ -29,7 +29,7 @@
/* TLB entry offset/size used for pinning kernel lowmem */
#define PPC44x_PIN_SHIFT 28
#define PPC44x_PIN_SIZE (1 << PPC44x_PIN_SHIFT)
#define PPC_PIN_SIZE (1 << PPC44x_PIN_SHIFT)
/* Lowest TLB slot consumed by the default pinned TLBs */
#define PPC44x_LOW_SLOT 63

2
include/asm-ppc/mpc8xx.h
View File

@ -113,6 +113,8 @@ enum ppc_sys_devices {
MPC8xx_CPM_USB,
};
#define PPC_PIN_SIZE (24 * 1024 * 1024) /* 24Mbytes of data pinned */
#ifndef BOARD_CHIP_NAME
#define BOARD_CHIP_NAME ""
#endif

6
include/asm-ppc/pgtable.h
View File

@ -12,6 +12,7 @@
#include <asm/processor.h> /* For TASK_SIZE */
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/io.h> /* For sub-arch specific PPC_PIN_SIZE */
struct mm_struct;
extern unsigned long va_to_phys(unsigned long address);
@ -127,9 +128,8 @@ extern unsigned long ioremap_bot, ioremap_base;
* of RAM. -- Cort
*/
#define VMALLOC_OFFSET (0x1000000) /* 16M */
#ifdef CONFIG_44x
#include <asm/ibm44x.h>
#define VMALLOC_START (((_ALIGN((long)high_memory, PPC44x_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
#ifdef PPC_PIN_SIZE
#define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
#else
#define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
#endif