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[ARM] 3017/1: Add support for 36-bit addresses to create_mapping() 

Patch from Deepak Saxena

This patch adds support for 36-bit static mapped I/O. While there
are no platforms in the tree ATM that use it, it has been tested
tested on the IXP2350 NPU and I would like to get the support for
that chipset upstream one piece at a time. There are also other
Intel chipset ports in development that are waiting on this to go
upstream.

The patch replaces the print formats for physical addresses with
%016llx which will create a bit extraneous output on 32-bit systems,
but I think that is cleaner than having #ifdefs, specially since
users will only see the output in error cases.

Depends on 3016/1.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Deepak Saxena 2005-10-28 15:19:12 +01:00 committed by Russell King
parent 9769c2468d
commit 0b7cd62ecd
1 changed files with 46 additions and 12 deletions
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58
arch/arm/mm/mm-armv.c
View File

@ -478,20 +478,20 @@ void __init create_mapping(struct map_desc *md)
unsigned long virt, length;
int prot_sect, prot_l1, domain;
pgprot_t prot_pte;
long off;
unsigned long off = (u32)__pfn_to_phys(md->pfn);
if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {
printk(KERN_WARNING "BUG: not creating mapping for "
"0x%08lx at 0x%08lx in user region\n",
__pfn_to_phys(md->pfn), md->virtual);
"0x%016llx at 0x%08lx in user region\n",
__pfn_to_phys((u64)md->pfn), md->virtual);
return;
}
if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
md->virtual >= PAGE_OFFSET && md->virtual < VMALLOC_END) {
printk(KERN_WARNING "BUG: mapping for 0x%08lx at 0x%08lx "
printk(KERN_WARNING "BUG: mapping for 0x%016llx at 0x%08lx "
"overlaps vmalloc space\n",
__pfn_to_phys(md->pfn), md->virtual);
__pfn_to_phys((u64)md->pfn), md->virtual);
}
domain = mem_types[md->type].domain;
@ -499,8 +499,33 @@ void __init create_mapping(struct map_desc *md)
prot_l1 = mem_types[md->type].prot_l1 | PMD_DOMAIN(domain);
prot_sect = mem_types[md->type].prot_sect | PMD_DOMAIN(domain);
/*
* Catch 36-bit addresses
*/
if(md->pfn >= 0x100000) {
if(domain) {
printk(KERN_ERR "MM: invalid domain in supersection "
"mapping for 0x%016llx at 0x%08lx\n",
__pfn_to_phys((u64)md->pfn), md->virtual);
return;
}
if((md->virtual | md->length | __pfn_to_phys(md->pfn))
& ~SUPERSECTION_MASK) {
printk(KERN_ERR "MM: cannot create mapping for "
"0x%016llx at 0x%08lx invalid alignment\n",
__pfn_to_phys((u64)md->pfn), md->virtual);
return;
}
/*
* Shift bits [35:32] of address into bits [23:20] of PMD
* (See ARMv6 spec).
*/
off |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);
}
virt = md->virtual;
off = __pfn_to_phys(md->pfn) - virt;
off -= virt;
length = md->length;
if (mem_types[md->type].prot_l1 == 0 &&
@ -525,13 +550,22 @@ void __init create_mapping(struct map_desc *md)
* of the actual domain assignments in use.
*/
if (cpu_architecture() >= CPU_ARCH_ARMv6 && domain == 0) {
/* Align to supersection boundary */
while ((virt & ~SUPERSECTION_MASK || (virt + off) &
~SUPERSECTION_MASK) && length >= (PGDIR_SIZE / 2)) {
alloc_init_section(virt, virt + off, prot_sect);
/*
* Align to supersection boundary if !high pages.
* High pages have already been checked for proper
* alignment above and they will fail the SUPSERSECTION_MASK
* check because of the way the address is encoded into
* offset.
*/
if (md->pfn <= 0x100000) {
while ((virt & ~SUPERSECTION_MASK ||
(virt + off) & ~SUPERSECTION_MASK) &&
length >= (PGDIR_SIZE / 2)) {
alloc_init_section(virt, virt + off, prot_sect);
virt += (PGDIR_SIZE / 2);
length -= (PGDIR_SIZE / 2);
virt += (PGDIR_SIZE / 2);
length -= (PGDIR_SIZE / 2);
}
}
while (length >= SUPERSECTION_SIZE) {