Contributors: 15
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Russell King |
300 |
36.50% |
18 |
41.86% |
| Afzal Mohammed |
181 |
22.02% |
2 |
4.65% |
| Vladimir Murzin |
91 |
11.07% |
3 |
6.98% |
| Catalin Marinas |
70 |
8.52% |
3 |
6.98% |
| Lorenzo Pieralisi |
41 |
4.99% |
1 |
2.33% |
| Rob Herring |
30 |
3.65% |
1 |
2.33% |
| Ard Biesheuvel |
29 |
3.53% |
2 |
4.65% |
| Jonathan Austin |
27 |
3.28% |
2 |
4.65% |
| Nico Pitre |
23 |
2.80% |
2 |
4.65% |
| Will Deacon |
11 |
1.34% |
1 |
2.33% |
| Laura Abbott |
10 |
1.22% |
4 |
9.30% |
| Hyok S. Choi |
5 |
0.61% |
1 |
2.33% |
| Jean-Philippe Brucker |
2 |
0.24% |
1 |
2.33% |
| Christoph Hellwig |
1 |
0.12% |
1 |
2.33% |
| Thomas Gleixner |
1 |
0.12% |
1 |
2.33% |
| Total |
822 |
|
43 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/mm/nommu.c
*
* ARM uCLinux supporting functions.
*/
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/kernel.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <asm/setup.h>
#include <asm/traps.h>
#include <asm/mach/arch.h>
#include <asm/cputype.h>
#include <asm/mpu.h>
#include <asm/procinfo.h>
#include "mm.h"
unsigned long vectors_base;
#ifdef CONFIG_ARM_MPU
struct mpu_rgn_info mpu_rgn_info;
#endif
#ifdef CONFIG_CPU_CP15
#ifdef CONFIG_CPU_HIGH_VECTOR
unsigned long setup_vectors_base(void)
{
unsigned long reg = get_cr();
set_cr(reg | CR_V);
return 0xffff0000;
}
#else /* CONFIG_CPU_HIGH_VECTOR */
/* Write exception base address to VBAR */
static inline void set_vbar(unsigned long val)
{
asm("mcr p15, 0, %0, c12, c0, 0" : : "r" (val) : "cc");
}
/*
* Security extensions, bits[7:4], permitted values,
* 0b0000 - not implemented, 0b0001/0b0010 - implemented
*/
static inline bool security_extensions_enabled(void)
{
/* Check CPUID Identification Scheme before ID_PFR1 read */
if ((read_cpuid_id() & 0x000f0000) == 0x000f0000)
return cpuid_feature_extract(CPUID_EXT_PFR1, 4) ||
cpuid_feature_extract(CPUID_EXT_PFR1, 20);
return 0;
}
unsigned long setup_vectors_base(void)
{
unsigned long base = 0, reg = get_cr();
set_cr(reg & ~CR_V);
if (security_extensions_enabled()) {
if (IS_ENABLED(CONFIG_REMAP_VECTORS_TO_RAM))
base = CONFIG_DRAM_BASE;
set_vbar(base);
} else if (IS_ENABLED(CONFIG_REMAP_VECTORS_TO_RAM)) {
if (CONFIG_DRAM_BASE != 0)
pr_err("Security extensions not enabled, vectors cannot be remapped to RAM, vectors base will be 0x00000000\n");
}
return base;
}
#endif /* CONFIG_CPU_HIGH_VECTOR */
#endif /* CONFIG_CPU_CP15 */
void __init arm_mm_memblock_reserve(void)
{
#ifndef CONFIG_CPU_V7M
vectors_base = IS_ENABLED(CONFIG_CPU_CP15) ? setup_vectors_base() : 0;
/*
* Register the exception vector page.
* some architectures which the DRAM is the exception vector to trap,
* alloc_page breaks with error, although it is not NULL, but "0."
*/
memblock_reserve(vectors_base, 2 * PAGE_SIZE);
#else /* ifndef CONFIG_CPU_V7M */
/*
* There is no dedicated vector page on V7-M. So nothing needs to be
* reserved here.
*/
#endif
/*
* In any case, always ensure address 0 is never used as many things
* get very confused if 0 is returned as a legitimate address.
*/
memblock_reserve(0, 1);
}
static void __init adjust_lowmem_bounds_mpu(void)
{
unsigned long pmsa = read_cpuid_ext(CPUID_EXT_MMFR0) & MMFR0_PMSA;
switch (pmsa) {
case MMFR0_PMSAv7:
pmsav7_adjust_lowmem_bounds();
break;
case MMFR0_PMSAv8:
pmsav8_adjust_lowmem_bounds();
break;
default:
break;
}
}
static void __init mpu_setup(void)
{
unsigned long pmsa = read_cpuid_ext(CPUID_EXT_MMFR0) & MMFR0_PMSA;
switch (pmsa) {
case MMFR0_PMSAv7:
pmsav7_setup();
break;
case MMFR0_PMSAv8:
pmsav8_setup();
break;
default:
break;
}
}
void __init adjust_lowmem_bounds(void)
{
phys_addr_t end;
adjust_lowmem_bounds_mpu();
end = memblock_end_of_DRAM();
high_memory = __va(end - 1) + 1;
memblock_set_current_limit(end);
}
/*
* paging_init() sets up the page tables, initialises the zone memory
* maps, and sets up the zero page, bad page and bad page tables.
*/
void __init paging_init(const struct machine_desc *mdesc)
{
early_trap_init((void *)vectors_base);
mpu_setup();
bootmem_init();
}
/*
* We don't need to do anything here for nommu machines.
*/
void setup_mm_for_reboot(void)
{
}
void flush_dcache_page(struct page *page)
{
__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
}
EXPORT_SYMBOL(flush_dcache_page);
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long uaddr, void *dst, const void *src,
unsigned long len)
{
memcpy(dst, src, len);
if (vma->vm_flags & VM_EXEC)
__cpuc_coherent_user_range(uaddr, uaddr + len);
}
void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
size_t size, unsigned int mtype)
{
if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
return NULL;
return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
}
EXPORT_SYMBOL(__arm_ioremap_pfn);
void __iomem *__arm_ioremap_caller(phys_addr_t phys_addr, size_t size,
unsigned int mtype, void *caller)
{
return (void __iomem *)phys_addr;
}
void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t, unsigned int, void *);
void __iomem *ioremap(resource_size_t res_cookie, size_t size)
{
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap);
void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
{
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_cache);
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_WC,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_wc);
#ifdef CONFIG_PCI
#include <asm/mach/map.h>
void __iomem *pci_remap_cfgspace(resource_size_t res_cookie, size_t size)
{
return arch_ioremap_caller(res_cookie, size, MT_UNCACHED,
__builtin_return_address(0));
}
EXPORT_SYMBOL_GPL(pci_remap_cfgspace);
#endif
void *arch_memremap_wb(phys_addr_t phys_addr, size_t size)
{
return (void *)phys_addr;
}
void __iounmap(volatile void __iomem *addr)
{
}
EXPORT_SYMBOL(__iounmap);
void (*arch_iounmap)(volatile void __iomem *);
void iounmap(volatile void __iomem *addr)
{
}
EXPORT_SYMBOL(iounmap);