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parisc: Increase initial kernel mapping to 32MB on 64bit kernel 

For the 64bit kernel the initially 16 MB kernel memory might become too
small if you build a kernel with many modules built-in and with kernel
text and data areas mapped on huge pages.

This patch increases the initial mapping to 32MB for 64bit kernels and
keeps 16MB for 32bit kernels.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2015-11-20 11:17:27 +01:00
parent 4182d0cdf8
commit 332b42e4eb
2 changed files with 7 additions and 3 deletions
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6
arch/parisc/include/asm/pgtable.h
View File

@ -83,7 +83,11 @@ static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e)) printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e))
/* This is the size of the initially mapped kernel memory */ /* This is the size of the initially mapped kernel memory */
#define KERNEL_INITIAL_ORDER 24 /* 0 to 1<<24 = 16MB */ #ifdef CONFIG_64BIT
#define KERNEL_INITIAL_ORDER 25 /* 1<<25 = 32MB */
#else
#define KERNEL_INITIAL_ORDER 24 /* 1<<24 = 16MB */
#endif
#define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER) #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER)
#if CONFIG_PGTABLE_LEVELS == 3 #if CONFIG_PGTABLE_LEVELS == 3

4
arch/parisc/kernel/head.S
View File

@ -69,7 +69,7 @@ $bss_loop:
stw,ma %arg2,4(%r1) stw,ma %arg2,4(%r1)
stw,ma %arg3,4(%r1) stw,ma %arg3,4(%r1)
/* Initialize startup VM. Just map first 8/16 MB of memory */ /* Initialize startup VM. Just map first 16/32 MB of memory */
load32 PA(swapper_pg_dir),%r4 load32 PA(swapper_pg_dir),%r4
mtctl %r4,%cr24 /* Initialize kernel root pointer */ mtctl %r4,%cr24 /* Initialize kernel root pointer */
mtctl %r4,%cr25 /* Initialize user root pointer */ mtctl %r4,%cr25 /* Initialize user root pointer */
@ -107,7 +107,7 @@ $bss_loop:
/* Now initialize the PTEs themselves. We use RWX for /* Now initialize the PTEs themselves. We use RWX for
* everything ... it will get remapped correctly later */ * everything ... it will get remapped correctly later */
ldo 0+_PAGE_KERNEL_RWX(%r0),%r3 /* Hardwired 0 phys addr start */ ldo 0+_PAGE_KERNEL_RWX(%r0),%r3 /* Hardwired 0 phys addr start */
ldi (1<<(KERNEL_INITIAL_ORDER-PAGE_SHIFT)),%r11 /* PFN count */ load32 (1<<(KERNEL_INITIAL_ORDER-PAGE_SHIFT)),%r11 /* PFN count */
load32 PA(pg0),%r1 load32 PA(pg0),%r1
$pgt_fill_loop: $pgt_fill_loop: