240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Memory subsystem initialization for Hexagon
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*
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <asm/atomic.h>
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#include <linux/highmem.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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#include <asm/vm_mmu.h>
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/*
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* Define a startpg just past the end of the kernel image and a lastpg
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* that corresponds to the end of real or simulated platform memory.
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*/
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#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
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unsigned long bootmem_lastpg; /* Should be set by platform code */
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unsigned long __phys_offset; /* physical kernel offset >> 12 */
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/* Set as variable to limit PMD copies */
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int max_kernel_seg = 0x303;
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/* indicate pfn's of high memory */
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unsigned long highstart_pfn, highend_pfn;
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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/* Default cache attribute for newly created page tables */
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unsigned long _dflt_cache_att = CACHEDEF;
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/*
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* The current "generation" of kernel map, which should not roll
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* over until Hell freezes over. Actual bound in years needs to be
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* calculated to confirm.
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*/
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DEFINE_SPINLOCK(kmap_gen_lock);
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/* checkpatch says don't init this to 0. */
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unsigned long long kmap_generation;
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/*
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* mem_init - initializes memory
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*
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* Frees up bootmem
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* Fixes up more stuff for HIGHMEM
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* Calculates and displays memory available/used
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*/
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void __init mem_init(void)
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{
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/* No idea where this is actually declared. Seems to evade LXR. */
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memblock_free_all();
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mem_init_print_info(NULL);
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/*
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* To-Do: someone somewhere should wipe out the bootmem map
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* after we're done?
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*/
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/*
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* This can be moved to some more virtual-memory-specific
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* initialization hook at some point. Set the init_mm
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* descriptors "context" value to point to the initial
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* kernel segment table's physical address.
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*/
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init_mm.context.ptbase = __pa(init_mm.pgd);
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}
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void sync_icache_dcache(pte_t pte)
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{
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unsigned long addr;
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struct page *page;
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page = pte_page(pte);
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addr = (unsigned long) page_address(page);
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__vmcache_idsync(addr, PAGE_SIZE);
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}
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/*
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* In order to set up page allocator "nodes",
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* somebody has to call free_area_init() for UMA.
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*
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* In this mode, we only have one pg_data_t
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* structure: contig_mem_data.
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*/
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void __init paging_init(void)
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{
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unsigned long zones_sizes[MAX_NR_ZONES] = {0, };
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/*
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* This is not particularly well documented anywhere, but
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* give ZONE_NORMAL all the memory, including the big holes
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* left by the kernel+bootmem_map which are already left as reserved
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* in the bootmem_map; free_area_init should see those bits and
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* adjust accordingly.
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*/
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zones_sizes[ZONE_NORMAL] = max_low_pfn;
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free_area_init(zones_sizes); /* sets up the zonelists and mem_map */
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/*
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* Start of high memory area. Will probably need something more
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* fancy if we... get more fancy.
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*/
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high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT);
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}
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#ifndef DMA_RESERVE
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#define DMA_RESERVE (4)
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#endif
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#define DMA_CHUNKSIZE (1<<22)
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#define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE)
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/*
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* Pick out the memory size. We look for mem=size,
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* where size is "size[KkMm]"
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*/
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static int __init early_mem(char *p)
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{
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unsigned long size;
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char *endp;
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size = memparse(p, &endp);
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bootmem_lastpg = PFN_DOWN(size);
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return 0;
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}
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early_param("mem", early_mem);
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size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
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void __init setup_arch_memory(void)
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{
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/* XXX Todo: this probably should be cleaned up */
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u32 *segtable = (u32 *) &swapper_pg_dir[0];
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u32 *segtable_end;
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/*
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* Set up boot memory allocator
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*
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* The Gorman book also talks about these functions.
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* This needs to change for highmem setups.
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*/
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/* Prior to this, bootmem_lastpg is actually mem size */
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bootmem_lastpg += ARCH_PFN_OFFSET;
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/* Memory size needs to be a multiple of 16M */
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bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
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~((BIG_KERNEL_PAGE_SIZE) - 1));
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memblock_add(PHYS_OFFSET,
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(bootmem_lastpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
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/* Reserve kernel text/data/bss */
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memblock_reserve(PHYS_OFFSET,
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(bootmem_startpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
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/*
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* Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
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* memory allocation
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*/
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max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
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min_low_pfn = ARCH_PFN_OFFSET;
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memblock_reserve(PFN_PHYS(max_low_pfn), DMA_RESERVED_BYTES);
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printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
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printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
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printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
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printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn);
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/*
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* The default VM page tables (will be) populated with
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* VA=PA+PAGE_OFFSET mapping. We go in and invalidate entries
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* higher than what we have memory for.
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*/
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/* this is pointer arithmetic; each entry covers 4MB */
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segtable = segtable + (PAGE_OFFSET >> 22);
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/* this actually only goes to the end of the first gig */
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segtable_end = segtable + (1<<(30-22));
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/*
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* Move forward to the start of empty pages; take into account
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* phys_offset shift.
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*/
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segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
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{
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int i;
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for (i = 1 ; i <= DMA_RESERVE ; i++)
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segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
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| __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X
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| __HEXAGON_C_UNC << 6
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| __HVM_PDE_S_4MB);
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}
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printk(KERN_INFO "clearing segtable from %p to %p\n", segtable,
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segtable_end);
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while (segtable < (segtable_end-8))
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*(segtable++) = __HVM_PDE_S_INVALID;
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/* stop the pointer at the device I/O 4MB page */
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printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n",
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segtable);
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#if 0
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/* Other half of the early device table from vm_init_segtable. */
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printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n",
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(unsigned long) _K_init_devicetable-PAGE_OFFSET);
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*segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) |
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__HVM_PDE_S_4KB;
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printk(KERN_INFO "*segtable = 0x%08x\n", *segtable);
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#endif
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/*
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* The bootmem allocator seemingly just lives to feed memory
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* to the paging system
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*/
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printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE);
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paging_init(); /* See Gorman Book, 2.3 */
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/*
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* At this point, the page allocator is kind of initialized, but
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* apparently no pages are available (just like with the bootmem
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* allocator), and need to be freed themselves via mem_init(),
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* which is called by start_kernel() later on in the process
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*/
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}
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