[ARM] 2853/1: Make alloc_init_supersection() work with 36-bit mappings
Patch from Deepak Saxena Working on adding support for 36-bit static mappings for ARMv6 and Intel's XSC3 core and noticed that alloc_init_supersection currently increments the phys addr by 1MB on each of the 16 iterations and then forces alignment to supersection size (16MB). This is really uneeded b/c we have already forced the phys address to be 16MB aligned in create_mapping(). Furthermore, this breaks 36-bit addressing b/c bits [23:20] of the PMD contain bits [35:32] of the physical address and the masking causes us to loose those bits thus ending up with an incorrect virt -> phys translation. The other option is to have an alloc_init_supersection36. Tested on Intel IXP2350 CPU with 36-bit static I/O mappings. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -275,11 +275,9 @@ alloc_init_supersection(unsigned long virt, unsigned long phys, int prot)
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int i;
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for (i = 0; i < 16; i += 1) {
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alloc_init_section(virt, phys & SUPERSECTION_MASK,
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prot | PMD_SECT_SUPER);
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alloc_init_section(virt, phys, prot | PMD_SECT_SUPER);
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virt += (PGDIR_SIZE / 2);
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phys += (PGDIR_SIZE / 2);
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}
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}
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