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Diffstat (limited to 'arch/openrisc/mm')
-rw-r--r--arch/openrisc/mm/fault.c42
-rw-r--r--arch/openrisc/mm/init.c92
-rw-r--r--arch/openrisc/mm/tlb.c1
3 files changed, 54 insertions, 81 deletions
diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
index a5dce82f864..0703acf7d32 100644
--- a/arch/openrisc/mm/fault.c
+++ b/arch/openrisc/mm/fault.c
@@ -54,6 +54,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
struct vm_area_struct *vma;
siginfo_t info;
int fault;
+ unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
tsk = current;
@@ -85,6 +86,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
if (user_mode(regs)) {
/* Exception was in userspace: reenable interrupts */
local_irq_enable();
+ flags |= FAULT_FLAG_USER;
} else {
/* If exception was in a syscall, then IRQ's may have
* been enabled or disabled. If they were enabled,
@@ -105,6 +107,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
if (in_interrupt() || !mm)
goto no_context;
+retry:
down_read(&mm->mmap_sem);
vma = find_vma(mm, address);
@@ -143,6 +146,7 @@ good_area:
if (write_acc) {
if (!(vma->vm_flags & VM_WRITE))
goto bad_area;
+ flags |= FAULT_FLAG_WRITE;
} else {
/* not present */
if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
@@ -159,7 +163,11 @@ good_area:
* the fault.
*/
- fault = handle_mm_fault(mm, vma, address, write_acc);
+ fault = handle_mm_fault(mm, vma, address, flags);
+
+ if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
+ return;
+
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@@ -167,11 +175,25 @@ good_area:
goto do_sigbus;
BUG();
}
- /*RGD modeled on Cris */
- if (fault & VM_FAULT_MAJOR)
- tsk->maj_flt++;
- else
- tsk->min_flt++;
+
+ if (flags & FAULT_FLAG_ALLOW_RETRY) {
+ /*RGD modeled on Cris */
+ if (fault & VM_FAULT_MAJOR)
+ tsk->maj_flt++;
+ else
+ tsk->min_flt++;
+ if (fault & VM_FAULT_RETRY) {
+ flags &= ~FAULT_FLAG_ALLOW_RETRY;
+ flags |= FAULT_FLAG_TRIED;
+
+ /* No need to up_read(&mm->mmap_sem) as we would
+ * have already released it in __lock_page_or_retry
+ * in mm/filemap.c.
+ */
+
+ goto retry;
+ }
+ }
up_read(&mm->mmap_sem);
return;
@@ -246,10 +268,10 @@ out_of_memory:
__asm__ __volatile__("l.nop 1");
up_read(&mm->mmap_sem);
- printk("VM: killing process %s\n", tsk->comm);
- if (user_mode(regs))
- do_exit(SIGKILL);
- goto no_context;
+ if (!user_mode(regs))
+ goto no_context;
+ pagefault_out_of_memory();
+ return;
do_sigbus:
up_read(&mm->mmap_sem);
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index 359dcb20fe8..7f94652311d 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -33,7 +33,6 @@
#include <linux/pagemap.h>
#include <linux/memblock.h>
-#include <asm/system.h>
#include <asm/segment.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
@@ -44,6 +43,7 @@
#include <asm/kmap_types.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
+#include <asm/sections.h>
int mem_init_done;
@@ -168,15 +168,26 @@ void __init paging_init(void)
unsigned long *dtlb_vector = __va(0x900);
unsigned long *itlb_vector = __va(0xa00);
+ printk(KERN_INFO "itlb_miss_handler %p\n", &itlb_miss_handler);
+ *itlb_vector = ((unsigned long)&itlb_miss_handler -
+ (unsigned long)itlb_vector) >> 2;
+
+ /* Soft ordering constraint to ensure that dtlb_vector is
+ * the last thing updated
+ */
+ barrier();
+
printk(KERN_INFO "dtlb_miss_handler %p\n", &dtlb_miss_handler);
*dtlb_vector = ((unsigned long)&dtlb_miss_handler -
(unsigned long)dtlb_vector) >> 2;
- printk(KERN_INFO "itlb_miss_handler %p\n", &itlb_miss_handler);
- *itlb_vector = ((unsigned long)&itlb_miss_handler -
- (unsigned long)itlb_vector) >> 2;
}
+ /* Soft ordering constraint to ensure that cache invalidation and
+ * TLB flush really happen _after_ code has been modified.
+ */
+ barrier();
+
/* Invalidate instruction caches after code modification */
mtspr(SPR_ICBIR, 0x900);
mtspr(SPR_ICBIR, 0xa00);
@@ -191,60 +202,20 @@ void __init paging_init(void)
/* References to section boundaries */
-extern char _stext, _etext, _edata, __bss_start, _end;
-extern char __init_begin, __init_end;
-
-static int __init free_pages_init(void)
-{
- int reservedpages, pfn;
-
- /* this will put all low memory onto the freelists */
- totalram_pages = free_all_bootmem();
-
- reservedpages = 0;
- for (pfn = 0; pfn < max_low_pfn; pfn++) {
- /*
- * Only count reserved RAM pages
- */
- if (PageReserved(mem_map + pfn))
- reservedpages++;
- }
-
- return reservedpages;
-}
-
-static void __init set_max_mapnr_init(void)
-{
- max_mapnr = num_physpages = max_low_pfn;
-}
-
void __init mem_init(void)
{
- int codesize, reservedpages, datasize, initsize;
-
- if (!mem_map)
- BUG();
-
- set_max_mapnr_init();
+ BUG_ON(!mem_map);
+ max_mapnr = max_low_pfn;
high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
/* clear the zero-page */
memset((void *)empty_zero_page, 0, PAGE_SIZE);
- reservedpages = free_pages_init();
-
- codesize = (unsigned long)&_etext - (unsigned long)&_stext;
- datasize = (unsigned long)&_edata - (unsigned long)&_etext;
- initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
+ /* this will put all low memory onto the freelists */
+ free_all_bootmem();
- printk(KERN_INFO
- "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
- (unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
- max_mapnr << (PAGE_SHIFT - 10), codesize >> 10,
- reservedpages << (PAGE_SHIFT - 10), datasize >> 10,
- initsize >> 10, (unsigned long)(0 << (PAGE_SHIFT - 10))
- );
+ mem_init_print_info(NULL);
printk("mem_init_done ...........................................\n");
mem_init_done = 1;
@@ -254,30 +225,11 @@ void __init mem_init(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
- printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
- (end - start) >> 10);
-
- for (; start < end; start += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(start));
- init_page_count(virt_to_page(start));
- free_page(start);
- totalram_pages++;
- }
+ free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void free_initmem(void)
{
- unsigned long addr;
-
- addr = (unsigned long)(&__init_begin);
- for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(addr));
- init_page_count(virt_to_page(addr));
- free_page(addr);
- totalram_pages++;
- }
- printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
- ((unsigned long)&__init_end -
- (unsigned long)&__init_begin) >> 10);
+ free_initmem_default(-1);
}
diff --git a/arch/openrisc/mm/tlb.c b/arch/openrisc/mm/tlb.c
index 56b0b89624a..683bd4d31c7 100644
--- a/arch/openrisc/mm/tlb.c
+++ b/arch/openrisc/mm/tlb.c
@@ -26,7 +26,6 @@
#include <linux/mm.h>
#include <linux/init.h>
-#include <asm/system.h>
#include <asm/segment.h>
#include <asm/tlbflush.h>
#include <asm/pgtable.h>
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 23:05:16 +0000