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[PATCH] Four level pagetables for ppc64

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Implement 4-level pagetables for ppc64

This patch implements full four-level page tables for ppc64, thereby
extending the usable user address range to 44 bits (16T).

The patch uses a full page for the tables at the bottom and top level,
and a quarter page for the intermediate levels.  It uses full 64-bit
pointers at every level, thus also increasing the addressable range of
physical memory.  This patch also tweaks the VSID allocation to allow
matching range for user addresses (this halves the number of available
contexts) and adds some #if and BUILD_BUG sanity checks.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
David Gibson
2005-08-05 19:39:06 +10:00
committed by Paul Mackerras
parent decd300b30
commit e28f7faf05
12 changed files with 305 additions and 289 deletions
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4
include/asm-ppc64/processor.h
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@@ -382,8 +382,8 @@ extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern struct task_struct *last_task_used_math;
extern struct task_struct *last_task_used_altivec;
/* 64-bit user address space is 41-bits (2TBs user VM) */
#define TASK_SIZE_USER64 (0x0000020000000000UL)
/* 64-bit user address space is 44-bits (16TB user VM) */
#define TASK_SIZE_USER64 (0x0000100000000000UL)
/*
* 32-bit user address space is 4GB - 1 page