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-rw-r--r--arch/powerpc/include/asm/mmu-hash64.h2
-rw-r--r--arch/powerpc/mm/hash_utils_64.c63
-rw-r--r--arch/powerpc/mm/init_64.c9
3 files changed, 43 insertions, 31 deletions
diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index 19c7a9403490..c2df53c5ceb9 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -278,7 +278,7 @@ extern int hash_huge_page(struct mm_struct *mm, unsigned long access,
unsigned long trap);
extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
- unsigned long pstart, unsigned long mode,
+ unsigned long pstart, unsigned long prot,
int psize, int ssize);
extern void set_huge_psize(int psize);
extern void add_gpage(unsigned long addr, unsigned long page_size,
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 5ce5a4dcd008..14be408dfc9b 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -151,39 +151,53 @@ static struct mmu_psize_def mmu_psize_defaults_gp[] = {
},
};
+static unsigned long htab_convert_pte_flags(unsigned long pteflags)
+{
+ unsigned long rflags = pteflags & 0x1fa;
+
+ /* _PAGE_EXEC -> NOEXEC */
+ if ((pteflags & _PAGE_EXEC) == 0)
+ rflags |= HPTE_R_N;
+
+ /* PP bits. PAGE_USER is already PP bit 0x2, so we only
+ * need to add in 0x1 if it's a read-only user page
+ */
+ if ((pteflags & _PAGE_USER) && !((pteflags & _PAGE_RW) &&
+ (pteflags & _PAGE_DIRTY)))
+ rflags |= 1;
+
+ /* Always add C */
+ return rflags | HPTE_R_C;
+}
int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
- unsigned long pstart, unsigned long mode,
+ unsigned long pstart, unsigned long prot,
int psize, int ssize)
{
unsigned long vaddr, paddr;
unsigned int step, shift;
- unsigned long tmp_mode;
int ret = 0;
shift = mmu_psize_defs[psize].shift;
step = 1 << shift;
+ prot = htab_convert_pte_flags(prot);
+
+ DBG("htab_bolt_mapping(%lx..%lx -> %lx (%lx,%d,%d)\n",
+ vstart, vend, pstart, prot, psize, ssize);
+
for (vaddr = vstart, paddr = pstart; vaddr < vend;
vaddr += step, paddr += step) {
unsigned long hash, hpteg;
unsigned long vsid = get_kernel_vsid(vaddr, ssize);
unsigned long va = hpt_va(vaddr, vsid, ssize);
- tmp_mode = mode;
-
- /* Make non-kernel text non-executable */
- if (!in_kernel_text(vaddr))
- tmp_mode = mode | HPTE_R_N;
-
hash = hpt_hash(va, shift, ssize);
hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
- DBG("htab_bolt_mapping: calling %p\n", ppc_md.hpte_insert);
-
BUG_ON(!ppc_md.hpte_insert);
- ret = ppc_md.hpte_insert(hpteg, va, paddr,
- tmp_mode, HPTE_V_BOLTED, psize, ssize);
+ ret = ppc_md.hpte_insert(hpteg, va, paddr, prot,
+ HPTE_V_BOLTED, psize, ssize);
if (ret < 0)
break;
@@ -519,9 +533,9 @@ static unsigned long __init htab_get_table_size(void)
#ifdef CONFIG_MEMORY_HOTPLUG
void create_section_mapping(unsigned long start, unsigned long end)
{
- BUG_ON(htab_bolt_mapping(start, end, __pa(start),
- _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX,
- mmu_linear_psize, mmu_kernel_ssize));
+ BUG_ON(htab_bolt_mapping(start, end, __pa(start),
+ PAGE_KERNEL, mmu_linear_psize,
+ mmu_kernel_ssize));
}
int remove_section_mapping(unsigned long start, unsigned long end)
@@ -570,7 +584,7 @@ void __init htab_initialize(void)
{
unsigned long table;
unsigned long pteg_count;
- unsigned long mode_rw;
+ unsigned long prot, tprot;
unsigned long base = 0, size = 0, limit;
int i;
@@ -628,7 +642,7 @@ void __init htab_initialize(void)
mtspr(SPRN_SDR1, _SDR1);
}
- mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
+ prot = PAGE_KERNEL;
#ifdef CONFIG_DEBUG_PAGEALLOC
linear_map_hash_count = lmb_end_of_DRAM() >> PAGE_SHIFT;
@@ -646,8 +660,10 @@ void __init htab_initialize(void)
for (i=0; i < lmb.memory.cnt; i++) {
base = (unsigned long)__va(lmb.memory.region[i].base);
size = lmb.memory.region[i].size;
+ tprot = prot | (in_kernel_text(base) ? _PAGE_EXEC : 0);
- DBG("creating mapping for region: %lx : %lx\n", base, size);
+ DBG("creating mapping for region: %lx..%lx (prot: %x)\n",
+ base, size, tprot);
#ifdef CONFIG_U3_DART
/* Do not map the DART space. Fortunately, it will be aligned
@@ -664,21 +680,21 @@ void __init htab_initialize(void)
unsigned long dart_table_end = dart_tablebase + 16 * MB;
if (base != dart_tablebase)
BUG_ON(htab_bolt_mapping(base, dart_tablebase,
- __pa(base), mode_rw,
+ __pa(base), tprot,
mmu_linear_psize,
mmu_kernel_ssize));
if ((base + size) > dart_table_end)
BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB,
base + size,
__pa(dart_table_end),
- mode_rw,
+ tprot,
mmu_linear_psize,
mmu_kernel_ssize));
continue;
}
#endif /* CONFIG_U3_DART */
BUG_ON(htab_bolt_mapping(base, base + size, __pa(base),
- mode_rw, mmu_linear_psize, mmu_kernel_ssize));
+ tprot, mmu_linear_psize, mmu_kernel_ssize));
}
/*
@@ -696,7 +712,7 @@ void __init htab_initialize(void)
tce_alloc_start = base + size + 1;
BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
- __pa(tce_alloc_start), mode_rw,
+ __pa(tce_alloc_start), prot,
mmu_linear_psize, mmu_kernel_ssize));
}
@@ -1117,8 +1133,7 @@ static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
unsigned long hash, hpteg;
unsigned long vsid = get_kernel_vsid(vaddr, mmu_kernel_ssize);
unsigned long va = hpt_va(vaddr, vsid, mmu_kernel_ssize);
- unsigned long mode = _PAGE_ACCESSED | _PAGE_DIRTY |
- _PAGE_COHERENT | PP_RWXX | HPTE_R_N;
+ unsigned long mode = htab_convert_pte_flags(PAGE_KERNEL);
int ret;
hash = hpt_hash(va, PAGE_SHIFT, mmu_kernel_ssize);
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 4f7df85129d8..036fe2f10c77 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -206,13 +206,10 @@ static int __meminit vmemmap_populated(unsigned long start, int page_size)
int __meminit vmemmap_populate(struct page *start_page,
unsigned long nr_pages, int node)
{
- unsigned long mode_rw;
unsigned long start = (unsigned long)start_page;
unsigned long end = (unsigned long)(start_page + nr_pages);
unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
- mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
-
/* Align to the page size of the linear mapping. */
start = _ALIGN_DOWN(start, page_size);
@@ -230,9 +227,9 @@ int __meminit vmemmap_populate(struct page *start_page,
pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n",
start, p, __pa(p));
- mapped = htab_bolt_mapping(start, start + page_size,
- __pa(p), mode_rw, mmu_vmemmap_psize,
- mmu_kernel_ssize);
+ mapped = htab_bolt_mapping(start, start + page_size, __pa(p),
+ PAGE_KERNEL, mmu_vmemmap_psize,
+ mmu_kernel_ssize);
BUG_ON(mapped < 0);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.