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parisc: add set_fixmap()/clear_fixmap() 

These functions will be used for adding code patching
functions later.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Sven Schnelle 2019-04-04 21:14:08 +02:00 committed by Helge Deller
parent 17d9822d4b
commit ccfbc68d41
4 changed files with 69 additions and 7 deletions
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19
arch/parisc/include/asm/fixmap.h
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@ -15,17 +15,34 @@
* from areas congruently mapped with user space. It is 8MB large
* and must be 16MB aligned */
#define TMPALIAS_MAP_START ((__PAGE_OFFSET) - 16*1024*1024)
#define FIXMAP_SIZE (FIX_BITMAP_COUNT << PAGE_SHIFT)
#define FIXMAP_START (TMPALIAS_MAP_START - FIXMAP_SIZE)
/* This is the kernel area for all maps (vmalloc, dma etc.) most
* usually, it extends up to TMPALIAS_MAP_START. Virtual addresses
* 0..GATEWAY_PAGE_SIZE are reserved for the gateway page */
#define KERNEL_MAP_START (GATEWAY_PAGE_SIZE)
#define KERNEL_MAP_END (TMPALIAS_MAP_START)
#define KERNEL_MAP_END (FIXMAP_START)
#ifndef __ASSEMBLY__
enum fixed_addresses {
/* Support writing RO kernel text via kprobes, jump labels, etc. */
FIX_TEXT_POKE0,
FIX_BITMAP_COUNT
};
extern void *parisc_vmalloc_start;
#define PCXL_DMA_MAP_SIZE (8*1024*1024)
#define VMALLOC_START ((unsigned long)parisc_vmalloc_start)
#define VMALLOC_END (KERNEL_MAP_END)
#define __fix_to_virt(_x) (FIXMAP_START + ((_x) << PAGE_SHIFT))
void set_fixmap(enum fixed_addresses idx, phys_addr_t phys);
void clear_fixmap(enum fixed_addresses idx);
#endif /*__ASSEMBLY__*/
#endif /*_ASM_FIXMAP_H*/

2
arch/parisc/mm/Makefile
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@ -2,5 +2,5 @@
# Makefile for arch/parisc/mm
#
obj-y := init.o fault.o ioremap.o
obj-y := init.o fault.o ioremap.o fixmap.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o

41
arch/parisc/mm/fixmap.c Normal file
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@ -0,0 +1,41 @@
// SPDX-License-Identifier: GPL-2.0
/*
* fixmaps for parisc
*
* Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
*/
#include <linux/kprobes.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
#include <asm/fixmap.h>
void set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
{
unsigned long vaddr = __fix_to_virt(idx);
pgd_t *pgd = pgd_offset_k(vaddr);
pmd_t *pmd = pmd_offset(pgd, vaddr);
pte_t *pte;
if (pmd_none(*pmd))
pmd = pmd_alloc(NULL, pgd, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
if (pte_none(*pte))
pte = pte_alloc_kernel(pmd, vaddr);
set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
}
void clear_fixmap(enum fixed_addresses idx)
{
unsigned long vaddr = __fix_to_virt(idx);
pgd_t *pgd = pgd_offset_k(vaddr);
pmd_t *pmd = pmd_offset(pgd, vaddr);
pte_t *pte = pte_offset_kernel(pmd, vaddr);
pte_clear(&init_mm, vaddr, pte);
flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
}

14
arch/parisc/mm/init.c
View File

@ -622,15 +622,19 @@ void __init mem_init(void)
* But keep code for debugging purposes.
*/
printk("virtual kernel memory layout:\n"
" vmalloc : 0x%px - 0x%px (%4ld MB)\n"
" memory : 0x%px - 0x%px (%4ld MB)\n"
" .init : 0x%px - 0x%px (%4ld kB)\n"
" .data : 0x%px - 0x%px (%4ld kB)\n"
" .text : 0x%px - 0x%px (%4ld kB)\n",
" vmalloc : 0x%px - 0x%px (%4ld MB)\n"
" fixmap : 0x%px - 0x%px (%4ld kB)\n"
" memory : 0x%px - 0x%px (%4ld MB)\n"
" .init : 0x%px - 0x%px (%4ld kB)\n"
" .data : 0x%px - 0x%px (%4ld kB)\n"
" .text : 0x%px - 0x%px (%4ld kB)\n",
(void*)VMALLOC_START, (void*)VMALLOC_END,
(VMALLOC_END - VMALLOC_START) >> 20,
(void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
(unsigned long)(FIXMAP_SIZE / 1024),
__va(0), high_memory,
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,