393 lines
8.4 KiB
C
393 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/m68k/mm/kmap.c
|
|
*
|
|
* Copyright (C) 1997 Roman Hodek
|
|
*
|
|
* 10/01/99 cleaned up the code and changing to the same interface
|
|
* used by other architectures /Roman Zippel
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/io.h>
|
|
|
|
#undef DEBUG
|
|
|
|
/*
|
|
* For 040/060 we can use the virtual memory area like other architectures,
|
|
* but for 020/030 we want to use early termination page descriptors and we
|
|
* can't mix this with normal page descriptors, so we have to copy that code
|
|
* (mm/vmalloc.c) and return appropriately aligned addresses.
|
|
*/
|
|
|
|
#ifdef CPU_M68040_OR_M68060_ONLY
|
|
|
|
#define IO_SIZE PAGE_SIZE
|
|
|
|
static inline struct vm_struct *get_io_area(unsigned long size)
|
|
{
|
|
return get_vm_area(size, VM_IOREMAP);
|
|
}
|
|
|
|
|
|
static inline void free_io_area(void *addr)
|
|
{
|
|
vfree((void *)(PAGE_MASK & (unsigned long)addr));
|
|
}
|
|
|
|
#else
|
|
|
|
#define IO_SIZE PMD_SIZE
|
|
|
|
static struct vm_struct *iolist;
|
|
|
|
/*
|
|
* __free_io_area unmaps nearly everything, so be careful
|
|
* Currently it doesn't free pointer/page tables anymore but this
|
|
* wasn't used anyway and might be added later.
|
|
*/
|
|
static void __free_io_area(void *addr, unsigned long size)
|
|
{
|
|
unsigned long virtaddr = (unsigned long)addr;
|
|
pgd_t *pgd_dir;
|
|
p4d_t *p4d_dir;
|
|
pud_t *pud_dir;
|
|
pmd_t *pmd_dir;
|
|
pte_t *pte_dir;
|
|
|
|
while ((long)size > 0) {
|
|
pgd_dir = pgd_offset_k(virtaddr);
|
|
p4d_dir = p4d_offset(pgd_dir, virtaddr);
|
|
pud_dir = pud_offset(p4d_dir, virtaddr);
|
|
if (pud_bad(*pud_dir)) {
|
|
printk("iounmap: bad pud(%08lx)\n", pud_val(*pud_dir));
|
|
pud_clear(pud_dir);
|
|
return;
|
|
}
|
|
pmd_dir = pmd_offset(pud_dir, virtaddr);
|
|
|
|
#if CONFIG_PGTABLE_LEVELS == 3
|
|
if (CPU_IS_020_OR_030) {
|
|
int pmd_type = pmd_val(*pmd_dir) & _DESCTYPE_MASK;
|
|
|
|
if (pmd_type == _PAGE_PRESENT) {
|
|
pmd_clear(pmd_dir);
|
|
virtaddr += PMD_SIZE;
|
|
size -= PMD_SIZE;
|
|
|
|
} else if (pmd_type == 0)
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
if (pmd_bad(*pmd_dir)) {
|
|
printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
|
|
pmd_clear(pmd_dir);
|
|
return;
|
|
}
|
|
pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
|
|
|
|
pte_val(*pte_dir) = 0;
|
|
virtaddr += PAGE_SIZE;
|
|
size -= PAGE_SIZE;
|
|
}
|
|
|
|
flush_tlb_all();
|
|
}
|
|
|
|
static struct vm_struct *get_io_area(unsigned long size)
|
|
{
|
|
unsigned long addr;
|
|
struct vm_struct **p, *tmp, *area;
|
|
|
|
area = kmalloc(sizeof(*area), GFP_KERNEL);
|
|
if (!area)
|
|
return NULL;
|
|
addr = KMAP_START;
|
|
for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
|
|
if (size + addr < (unsigned long)tmp->addr)
|
|
break;
|
|
if (addr > KMAP_END-size) {
|
|
kfree(area);
|
|
return NULL;
|
|
}
|
|
addr = tmp->size + (unsigned long)tmp->addr;
|
|
}
|
|
area->addr = (void *)addr;
|
|
area->size = size + IO_SIZE;
|
|
area->next = *p;
|
|
*p = area;
|
|
return area;
|
|
}
|
|
|
|
static inline void free_io_area(void *addr)
|
|
{
|
|
struct vm_struct **p, *tmp;
|
|
|
|
if (!addr)
|
|
return;
|
|
addr = (void *)((unsigned long)addr & -IO_SIZE);
|
|
for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
|
|
if (tmp->addr == addr) {
|
|
*p = tmp->next;
|
|
/* remove gap added in get_io_area() */
|
|
__free_io_area(tmp->addr, tmp->size - IO_SIZE);
|
|
kfree(tmp);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Map some physical address range into the kernel address space.
|
|
*/
|
|
/* Rewritten by Andreas Schwab to remove all races. */
|
|
|
|
void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
|
|
{
|
|
struct vm_struct *area;
|
|
unsigned long virtaddr, retaddr;
|
|
long offset;
|
|
pgd_t *pgd_dir;
|
|
p4d_t *p4d_dir;
|
|
pud_t *pud_dir;
|
|
pmd_t *pmd_dir;
|
|
pte_t *pte_dir;
|
|
|
|
/*
|
|
* Don't allow mappings that wrap..
|
|
*/
|
|
if (!size || physaddr > (unsigned long)(-size))
|
|
return NULL;
|
|
|
|
#ifdef CONFIG_AMIGA
|
|
if (MACH_IS_AMIGA) {
|
|
if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
|
|
&& (cacheflag == IOMAP_NOCACHE_SER))
|
|
return (void __iomem *)physaddr;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_COLDFIRE
|
|
if (__cf_internalio(physaddr))
|
|
return (void __iomem *) physaddr;
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
|
|
#endif
|
|
/*
|
|
* Mappings have to be aligned
|
|
*/
|
|
offset = physaddr & (IO_SIZE - 1);
|
|
physaddr &= -IO_SIZE;
|
|
size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
|
|
|
|
/*
|
|
* Ok, go for it..
|
|
*/
|
|
area = get_io_area(size);
|
|
if (!area)
|
|
return NULL;
|
|
|
|
virtaddr = (unsigned long)area->addr;
|
|
retaddr = virtaddr + offset;
|
|
#ifdef DEBUG
|
|
printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
|
|
#endif
|
|
|
|
/*
|
|
* add cache and table flags to physical address
|
|
*/
|
|
if (CPU_IS_040_OR_060) {
|
|
physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
|
|
_PAGE_ACCESSED | _PAGE_DIRTY);
|
|
switch (cacheflag) {
|
|
case IOMAP_FULL_CACHING:
|
|
physaddr |= _PAGE_CACHE040;
|
|
break;
|
|
case IOMAP_NOCACHE_SER:
|
|
default:
|
|
physaddr |= _PAGE_NOCACHE_S;
|
|
break;
|
|
case IOMAP_NOCACHE_NONSER:
|
|
physaddr |= _PAGE_NOCACHE;
|
|
break;
|
|
case IOMAP_WRITETHROUGH:
|
|
physaddr |= _PAGE_CACHE040W;
|
|
break;
|
|
}
|
|
} else {
|
|
physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
|
|
_PAGE_DIRTY | _PAGE_READWRITE);
|
|
switch (cacheflag) {
|
|
case IOMAP_NOCACHE_SER:
|
|
case IOMAP_NOCACHE_NONSER:
|
|
default:
|
|
physaddr |= _PAGE_NOCACHE030;
|
|
break;
|
|
case IOMAP_FULL_CACHING:
|
|
case IOMAP_WRITETHROUGH:
|
|
break;
|
|
}
|
|
}
|
|
|
|
while ((long)size > 0) {
|
|
#ifdef DEBUG
|
|
if (!(virtaddr & (PMD_SIZE-1)))
|
|
printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
|
|
#endif
|
|
pgd_dir = pgd_offset_k(virtaddr);
|
|
p4d_dir = p4d_offset(pgd_dir, virtaddr);
|
|
pud_dir = pud_offset(p4d_dir, virtaddr);
|
|
pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
|
|
if (!pmd_dir) {
|
|
printk("ioremap: no mem for pmd_dir\n");
|
|
return NULL;
|
|
}
|
|
|
|
#if CONFIG_PGTABLE_LEVELS == 3
|
|
if (CPU_IS_020_OR_030) {
|
|
pmd_val(*pmd_dir) = physaddr;
|
|
physaddr += PMD_SIZE;
|
|
virtaddr += PMD_SIZE;
|
|
size -= PMD_SIZE;
|
|
} else
|
|
#endif
|
|
{
|
|
pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
|
|
if (!pte_dir) {
|
|
printk("ioremap: no mem for pte_dir\n");
|
|
return NULL;
|
|
}
|
|
|
|
pte_val(*pte_dir) = physaddr;
|
|
virtaddr += PAGE_SIZE;
|
|
physaddr += PAGE_SIZE;
|
|
size -= PAGE_SIZE;
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
printk("\n");
|
|
#endif
|
|
flush_tlb_all();
|
|
|
|
return (void __iomem *)retaddr;
|
|
}
|
|
EXPORT_SYMBOL(__ioremap);
|
|
|
|
/*
|
|
* Unmap an ioremap()ed region again
|
|
*/
|
|
void iounmap(void __iomem *addr)
|
|
{
|
|
#ifdef CONFIG_AMIGA
|
|
if ((!MACH_IS_AMIGA) ||
|
|
(((unsigned long)addr < 0x40000000) ||
|
|
((unsigned long)addr > 0x60000000)))
|
|
free_io_area((__force void *)addr);
|
|
#else
|
|
#ifdef CONFIG_COLDFIRE
|
|
if (cf_internalio(addr))
|
|
return;
|
|
#endif
|
|
free_io_area((__force void *)addr);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(iounmap);
|
|
|
|
/*
|
|
* Set new cache mode for some kernel address space.
|
|
* The caller must push data for that range itself, if such data may already
|
|
* be in the cache.
|
|
*/
|
|
void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
|
|
{
|
|
unsigned long virtaddr = (unsigned long)addr;
|
|
pgd_t *pgd_dir;
|
|
p4d_t *p4d_dir;
|
|
pud_t *pud_dir;
|
|
pmd_t *pmd_dir;
|
|
pte_t *pte_dir;
|
|
|
|
if (CPU_IS_040_OR_060) {
|
|
switch (cmode) {
|
|
case IOMAP_FULL_CACHING:
|
|
cmode = _PAGE_CACHE040;
|
|
break;
|
|
case IOMAP_NOCACHE_SER:
|
|
default:
|
|
cmode = _PAGE_NOCACHE_S;
|
|
break;
|
|
case IOMAP_NOCACHE_NONSER:
|
|
cmode = _PAGE_NOCACHE;
|
|
break;
|
|
case IOMAP_WRITETHROUGH:
|
|
cmode = _PAGE_CACHE040W;
|
|
break;
|
|
}
|
|
} else {
|
|
switch (cmode) {
|
|
case IOMAP_NOCACHE_SER:
|
|
case IOMAP_NOCACHE_NONSER:
|
|
default:
|
|
cmode = _PAGE_NOCACHE030;
|
|
break;
|
|
case IOMAP_FULL_CACHING:
|
|
case IOMAP_WRITETHROUGH:
|
|
cmode = 0;
|
|
}
|
|
}
|
|
|
|
while ((long)size > 0) {
|
|
pgd_dir = pgd_offset_k(virtaddr);
|
|
p4d_dir = p4d_offset(pgd_dir, virtaddr);
|
|
pud_dir = pud_offset(p4d_dir, virtaddr);
|
|
if (pud_bad(*pud_dir)) {
|
|
printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
|
|
pud_clear(pud_dir);
|
|
return;
|
|
}
|
|
pmd_dir = pmd_offset(pud_dir, virtaddr);
|
|
|
|
#if CONFIG_PGTABLE_LEVELS == 3
|
|
if (CPU_IS_020_OR_030) {
|
|
unsigned long pmd = pmd_val(*pmd_dir);
|
|
|
|
if ((pmd & _DESCTYPE_MASK) == _PAGE_PRESENT) {
|
|
*pmd_dir = __pmd((pmd & _CACHEMASK040) | cmode);
|
|
virtaddr += PMD_SIZE;
|
|
size -= PMD_SIZE;
|
|
continue;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (pmd_bad(*pmd_dir)) {
|
|
printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
|
|
pmd_clear(pmd_dir);
|
|
return;
|
|
}
|
|
pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
|
|
|
|
pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
|
|
virtaddr += PAGE_SIZE;
|
|
size -= PAGE_SIZE;
|
|
}
|
|
|
|
flush_tlb_all();
|
|
}
|
|
EXPORT_SYMBOL(kernel_set_cachemode);
|