[PATCH] Generic ioremap_page_range: implementation
This patch adds a generic implementation of ioremap_page_range() in lib/ioremap.c based on the i386 implementation. It differs from the i386 version in the following ways: * The PTE flags are passed as a pgprot_t argument and must be determined up front by the arch-specific code. No additional PTE flags are added. * Uses set_pte_at() instead of set_pte() [bunk@stusta.de: warning fix] ]dhowells@redhat.com: nommu build fix] Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Mikael Starvik <starvik@axis.com> Cc: Andi Kleen <ak@suse.de> Cc: <linux-m32r@ml.linux-m32r.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@parisc-linux.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>hifive-unleashed-5.1
parent
bc03613dec
commit
74588d8ba3
|
@ -19,8 +19,12 @@
|
||||||
#define _LINUX_IO_H
|
#define _LINUX_IO_H
|
||||||
|
|
||||||
#include <asm/io.h>
|
#include <asm/io.h>
|
||||||
|
#include <asm/page.h>
|
||||||
|
|
||||||
void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
|
void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
|
||||||
void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
|
void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
|
||||||
|
|
||||||
|
int ioremap_page_range(unsigned long addr, unsigned long end,
|
||||||
|
unsigned long phys_addr, pgprot_t prot);
|
||||||
|
|
||||||
#endif /* _LINUX_IO_H */
|
#endif /* _LINUX_IO_H */
|
||||||
|
|
|
@ -7,6 +7,7 @@ lib-y := errno.o ctype.o string.o vsprintf.o cmdline.o \
|
||||||
idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
|
idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
|
||||||
sha1.o
|
sha1.o
|
||||||
|
|
||||||
|
lib-$(CONFIG_MMU) += ioremap.o
|
||||||
lib-$(CONFIG_SMP) += cpumask.o
|
lib-$(CONFIG_SMP) += cpumask.o
|
||||||
|
|
||||||
lib-y += kobject.o kref.o kobject_uevent.o klist.o
|
lib-y += kobject.o kref.o kobject_uevent.o klist.o
|
||||||
|
|
|
@ -0,0 +1,94 @@
|
||||||
|
/*
|
||||||
|
* Re-map IO memory to kernel address space so that we can access it.
|
||||||
|
* This is needed for high PCI addresses that aren't mapped in the
|
||||||
|
* 640k-1MB IO memory area on PC's
|
||||||
|
*
|
||||||
|
* (C) Copyright 1995 1996 Linus Torvalds
|
||||||
|
*/
|
||||||
|
#include <linux/io.h>
|
||||||
|
#include <linux/vmalloc.h>
|
||||||
|
#include <linux/mm.h>
|
||||||
|
|
||||||
|
#include <asm/cacheflush.h>
|
||||||
|
#include <asm/pgtable.h>
|
||||||
|
|
||||||
|
static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
|
||||||
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
||||||
|
{
|
||||||
|
pte_t *pte;
|
||||||
|
unsigned long pfn;
|
||||||
|
|
||||||
|
pfn = phys_addr >> PAGE_SHIFT;
|
||||||
|
pte = pte_alloc_kernel(pmd, addr);
|
||||||
|
if (!pte)
|
||||||
|
return -ENOMEM;
|
||||||
|
do {
|
||||||
|
BUG_ON(!pte_none(*pte));
|
||||||
|
set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
|
||||||
|
pfn++;
|
||||||
|
} while (pte++, addr += PAGE_SIZE, addr != end);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
|
||||||
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
||||||
|
{
|
||||||
|
pmd_t *pmd;
|
||||||
|
unsigned long next;
|
||||||
|
|
||||||
|
phys_addr -= addr;
|
||||||
|
pmd = pmd_alloc(&init_mm, pud, addr);
|
||||||
|
if (!pmd)
|
||||||
|
return -ENOMEM;
|
||||||
|
do {
|
||||||
|
next = pmd_addr_end(addr, end);
|
||||||
|
if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
|
||||||
|
return -ENOMEM;
|
||||||
|
} while (pmd++, addr = next, addr != end);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
|
||||||
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
||||||
|
{
|
||||||
|
pud_t *pud;
|
||||||
|
unsigned long next;
|
||||||
|
|
||||||
|
phys_addr -= addr;
|
||||||
|
pud = pud_alloc(&init_mm, pgd, addr);
|
||||||
|
if (!pud)
|
||||||
|
return -ENOMEM;
|
||||||
|
do {
|
||||||
|
next = pud_addr_end(addr, end);
|
||||||
|
if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
|
||||||
|
return -ENOMEM;
|
||||||
|
} while (pud++, addr = next, addr != end);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int ioremap_page_range(unsigned long addr,
|
||||||
|
unsigned long end, unsigned long phys_addr, pgprot_t prot)
|
||||||
|
{
|
||||||
|
pgd_t *pgd;
|
||||||
|
unsigned long start;
|
||||||
|
unsigned long next;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
BUG_ON(addr >= end);
|
||||||
|
|
||||||
|
flush_cache_all();
|
||||||
|
|
||||||
|
start = addr;
|
||||||
|
phys_addr -= addr;
|
||||||
|
pgd = pgd_offset_k(addr);
|
||||||
|
do {
|
||||||
|
next = pgd_addr_end(addr, end);
|
||||||
|
err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot);
|
||||||
|
if (err)
|
||||||
|
break;
|
||||||
|
} while (pgd++, addr = next, addr != end);
|
||||||
|
|
||||||
|
flush_tlb_all();
|
||||||
|
|
||||||
|
return err;
|
||||||
|
}
|
Loading…
Reference in New Issue