diff options
Diffstat (limited to 'arch/metag/mm/mmu-meta1.c')
-rw-r--r-- | arch/metag/mm/mmu-meta1.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/metag/mm/mmu-meta1.c b/arch/metag/mm/mmu-meta1.c deleted file mode 100644 index 53190b13dc54..000000000000 --- a/arch/metag/mm/mmu-meta1.c +++ /dev/null @@ -1,157 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2005,2006,2007,2008,2009 Imagination Technologies - * - * Meta 1 MMU handling code. - * - */ - -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/io.h> - -#include <asm/mmu.h> - -#define DM3_BASE (LINSYSDIRECT_BASE + (MMCU_DIRECTMAPn_ADDR_SCALE * 3)) - -/* - * This contains the physical address of the top level 2k pgd table. - */ -static unsigned long mmu_base_phys; - -/* - * Given a physical address, return a mapped virtual address that can be used - * to access that location. - * In practice, we use the DirectMap region to make this happen. - */ -static unsigned long map_addr(unsigned long phys) -{ - static unsigned long dm_base = 0xFFFFFFFF; - int offset; - - offset = phys - dm_base; - - /* Are we in the current map range ? */ - if ((offset < 0) || (offset >= MMCU_DIRECTMAPn_ADDR_SCALE)) { - /* Calculate new DM area */ - dm_base = phys & ~(MMCU_DIRECTMAPn_ADDR_SCALE - 1); - - /* Actually map it in! */ - metag_out32(dm_base, MMCU_DIRECTMAP3_ADDR); - - /* And calculate how far into that area our reference is */ - offset = phys - dm_base; - } - - return DM3_BASE + offset; -} - -/* - * Return the physical address of the base of our pgd table. - */ -static inline unsigned long __get_mmu_base(void) -{ - unsigned long base_phys; - unsigned int stride; - - if (is_global_space(PAGE_OFFSET)) - stride = 4; - else - stride = hard_processor_id(); /* [0..3] */ - - base_phys = metag_in32(MMCU_TABLE_PHYS_ADDR); - base_phys += (0x800 * stride); - - return base_phys; -} - -/* Given a virtual address, return the virtual address of the relevant pgd */ -static unsigned long pgd_entry_addr(unsigned long virt) -{ - unsigned long pgd_phys; - unsigned long pgd_virt; - - if (!mmu_base_phys) - mmu_base_phys = __get_mmu_base(); - - /* - * Are we trying to map a global address. If so, then index - * the global pgd table instead of our local one. - */ - if (is_global_space(virt)) { - /* Scale into 2gig map */ - virt &= ~0x80000000; - } - - /* Base of the pgd table plus our 4Meg entry, 4bytes each */ - pgd_phys = mmu_base_phys + ((virt >> PGDIR_SHIFT) * 4); - - pgd_virt = map_addr(pgd_phys); - - return pgd_virt; -} - -/* Given a virtual address, return the virtual address of the relevant pte */ -static unsigned long pgtable_entry_addr(unsigned long virt) -{ - unsigned long pgtable_phys; - unsigned long pgtable_virt, pte_virt; - - /* Find the physical address of the 4MB page table*/ - pgtable_phys = metag_in32(pgd_entry_addr(virt)) & MMCU_ENTRY_ADDR_BITS; - - /* Map it to a virtual address */ - pgtable_virt = map_addr(pgtable_phys); - - /* And index into it for our pte */ - pte_virt = pgtable_virt + ((virt >> PAGE_SHIFT) & 0x3FF) * 4; - - return pte_virt; -} - -unsigned long mmu_read_first_level_page(unsigned long vaddr) -{ - return metag_in32(pgd_entry_addr(vaddr)); -} - -unsigned long mmu_read_second_level_page(unsigned long vaddr) -{ - return metag_in32(pgtable_entry_addr(vaddr)); -} - -unsigned long mmu_get_base(void) -{ - static unsigned long __base; - - /* Find the base of our MMU pgd table */ - if (!__base) - __base = pgd_entry_addr(0); - - return __base; -} - -void __init mmu_init(unsigned long mem_end) -{ - unsigned long entry, addr; - pgd_t *p_swapper_pg_dir; - - /* - * Now copy over any MMU pgd entries already in the mmu page tables - * over to our root init process (swapper_pg_dir) map. This map is - * then inherited by all other processes, which means all processes - * inherit a map of the kernel space. - */ - addr = PAGE_OFFSET; - entry = pgd_index(PAGE_OFFSET); - p_swapper_pg_dir = pgd_offset_k(0) + entry; - - while (addr <= META_MEMORY_LIMIT) { - unsigned long pgd_entry; - /* copy over the current MMU value */ - pgd_entry = mmu_read_first_level_page(addr); - pgd_val(*p_swapper_pg_dir) = pgd_entry; - - p_swapper_pg_dir++; - addr += PGDIR_SIZE; - } -} |