tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/arch/arm/mm/nommu.c
3 *
4 * ARM uCLinux supporting functions.
5 */
6#include <linux/module.h>
7#include <linux/mm.h>
8#include <linux/pagemap.h>
9#include <linux/bootmem.h>
10
11#include <asm/cacheflush.h>
12#include <asm/io.h>
13#include <asm/page.h>
14#include <asm/mach/arch.h>
15
16#include "mm.h"
17
18extern void _stext, __data_start, _end;
19
20/*
21 * Reserve the various regions of node 0
22 */
23void __init reserve_node_zero(pg_data_t *pgdat)
24{
25 /*
26 * Register the kernel text and data with bootmem.
27 * Note that this can only be in node 0.
28 */
29#ifdef CONFIG_XIP_KERNEL
30 reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start,
31 BOOTMEM_DEFAULT);
32#else
33 reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext,
34 BOOTMEM_DEFAULT);
35#endif
36
37 /*
38 * Register the exception vector page.
39 * some architectures which the DRAM is the exception vector to trap,
40 * alloc_page breaks with error, although it is not NULL, but "0."
41 */
42 reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE,
43 BOOTMEM_DEFAULT);
44}
45
46/*
47 * paging_init() sets up the page tables, initialises the zone memory
48 * maps, and sets up the zero page, bad page and bad page tables.
49 */
50void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
51{
52 bootmem_init(mi);
53}
54
55/*
56 * We don't need to do anything here for nommu machines.
57 */
58void setup_mm_for_reboot(char mode)
59{
60}
61
62void flush_dcache_page(struct page *page)
63{
64 __cpuc_flush_dcache_page(page_address(page));
65}
66EXPORT_SYMBOL(flush_dcache_page);
67
68void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
69 size_t size, unsigned int mtype)
70{
71 if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
72 return NULL;
73 return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
74}
75EXPORT_SYMBOL(__arm_ioremap_pfn);
76
77void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
78 unsigned int mtype)
79{
80 return (void __iomem *)phys_addr;
81}
82EXPORT_SYMBOL(__arm_ioremap);
83
84void __iounmap(volatile void __iomem *addr)
85{
86}
87EXPORT_SYMBOL(__iounmap);