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Subject[PATCH 4/5] csky: Separate fixaddr_init from highmem
Date
From: Guo Ren <ren_guo@c-sky.com>

After fixaddr_init is separated from highmem, we could use tcm
without highmem selected. (610 (abiv1) don't support highmem,
but it could use tcm now.)

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
arch/csky/Kconfig | 1 -
arch/csky/include/asm/fixmap.h | 4 +++
arch/csky/include/asm/memory.h | 3 ++
arch/csky/include/asm/pgtable.h | 6 +---
arch/csky/kernel/setup.c | 2 ++
arch/csky/mm/highmem.c | 64 +++------------------------------
arch/csky/mm/init.c | 47 ++++++++++++++++++++++++
7 files changed, 61 insertions(+), 66 deletions(-)

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 77e8e077648a..7f142eecdbfc 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -190,7 +190,6 @@ endchoice

menuconfig HAVE_TCM
bool "Tightly-Coupled/Sram Memory"
- depends on HIGHMEM
select GENERIC_ALLOCATOR
help
The implementation are not only used by TCM (Tightly-Coupled Meory)
diff --git a/arch/csky/include/asm/fixmap.h b/arch/csky/include/asm/fixmap.h
index 4350578faa1c..81f9477d5330 100644
--- a/arch/csky/include/asm/fixmap.h
+++ b/arch/csky/include/asm/fixmap.h
@@ -27,4 +27,8 @@ enum fixed_addresses {

#include <asm-generic/fixmap.h>

+extern void fixrange_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base);
+extern void __init fixaddr_init(void);
+
#endif /* __ASM_CSKY_FIXMAP_H */
diff --git a/arch/csky/include/asm/memory.h b/arch/csky/include/asm/memory.h
index cdffbd0a500b..a65c6759f537 100644
--- a/arch/csky/include/asm/memory.h
+++ b/arch/csky/include/asm/memory.h
@@ -9,6 +9,9 @@
#include <linux/sizes.h>

#define FIXADDR_TOP _AC(0xffffc000, UL)
+#define PKMAP_BASE _AC(0xff800000, UL)
+#define VMALLOC_START _AC(0xc0008000, UL)
+#define VMALLOC_END (PKMAP_BASE - (PAGE_SIZE * 2))

#ifdef CONFIG_HAVE_TCM
#ifdef CONFIG_HAVE_DTCM
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index 7c21985c60dc..bd86c3fe0733 100644
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -5,6 +5,7 @@
#define __ASM_CSKY_PGTABLE_H

#include <asm/fixmap.h>
+#include <asm/memory.h>
#include <asm/addrspace.h>
#include <abi/pgtable-bits.h>
#include <asm-generic/pgtable-nopmd.h>
@@ -16,11 +17,6 @@
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0UL

-#define PKMAP_BASE (0xff800000)
-
-#define VMALLOC_START (0xc0008000)
-#define VMALLOC_END (PKMAP_BASE - 2*PAGE_SIZE)
-
/*
* C-SKY is two-level paging structure:
*/
diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
index 23ee604aafdb..4f7786ccfceb 100644
--- a/arch/csky/kernel/setup.c
+++ b/arch/csky/kernel/setup.c
@@ -133,6 +133,8 @@ void __init setup_arch(char **cmdline_p)

sparse_init();

+ fixaddr_init();
+
#ifdef CONFIG_HIGHMEM
kmap_init();
#endif
diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c
index 3317b774f6dc..813129145f3d 100644
--- a/arch/csky/mm/highmem.c
+++ b/arch/csky/mm/highmem.c
@@ -117,85 +117,29 @@ struct page *kmap_atomic_to_page(void *ptr)
return pte_page(*pte);
}

-static void __init fixrange_init(unsigned long start, unsigned long end,
- pgd_t *pgd_base)
+static void __init kmap_pages_init(void)
{
-#ifdef CONFIG_HIGHMEM
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- int i, j, k;
unsigned long vaddr;
-
- vaddr = start;
- i = __pgd_offset(vaddr);
- j = __pud_offset(vaddr);
- k = __pmd_offset(vaddr);
- pgd = pgd_base + i;
-
- for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
- pud = (pud_t *)pgd;
- for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
- pmd = (pmd_t *)pud;
- for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
- if (pmd_none(*pmd)) {
- pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
- if (!pte)
- panic("%s: Failed to allocate %lu bytes align=%lx\n",
- __func__, PAGE_SIZE,
- PAGE_SIZE);
-
- set_pmd(pmd, __pmd(__pa(pte)));
- BUG_ON(pte != pte_offset_kernel(pmd, 0));
- }
- vaddr += PMD_SIZE;
- }
- k = 0;
- }
- j = 0;
- }
-#endif
-}
-
-void __init fixaddr_kmap_pages_init(void)
-{
- unsigned long vaddr;
- pgd_t *pgd_base;
-#ifdef CONFIG_HIGHMEM
pgd_t *pgd;
pmd_t *pmd;
pud_t *pud;
pte_t *pte;
-#endif
- pgd_base = swapper_pg_dir;
-
- /*
- * Fixed mappings:
- */
- vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
- fixrange_init(vaddr, 0, pgd_base);
-
-#ifdef CONFIG_HIGHMEM
- /*
- * Permanent kmaps:
- */
+
vaddr = PKMAP_BASE;
- fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
+ fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);

pgd = swapper_pg_dir + __pgd_offset(vaddr);
pud = (pud_t *)pgd;
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;
-#endif
}

void __init kmap_init(void)
{
unsigned long vaddr;

- fixaddr_kmap_pages_init();
+ kmap_pages_init();

vaddr = __fix_to_virt(FIX_KMAP_BEGIN);

diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index d4c2292ea46b..322eb7bd7962 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -101,3 +101,50 @@ void __init pre_mmu_init(void)
/* Setup page mask to 4k */
write_mmu_pagemask(0);
}
+
+void __init fixrange_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ int i, j, k;
+ unsigned long vaddr;
+
+ vaddr = start;
+ i = __pgd_offset(vaddr);
+ j = __pud_offset(vaddr);
+ k = __pmd_offset(vaddr);
+ pgd = pgd_base + i;
+
+ for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
+ pud = (pud_t *)pgd;
+ for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
+ pmd = (pmd_t *)pud;
+ for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
+ if (pmd_none(*pmd)) {
+ pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+ if (!pte)
+ panic("%s: Failed to allocate %lu bytes align=%lx\n",
+ __func__, PAGE_SIZE,
+ PAGE_SIZE);
+
+ set_pmd(pmd, __pmd(__pa(pte)));
+ BUG_ON(pte != pte_offset_kernel(pmd, 0));
+ }
+ vaddr += PMD_SIZE;
+ }
+ k = 0;
+ }
+ j = 0;
+ }
+}
+
+void __init fixaddr_init(void)
+{
+ unsigned long vaddr;
+
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
+}
--
2.17.0
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