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https://opencores.org/ocsvn/c0or1k/c0or1k/trunk
Subversion Repositories c0or1k
[/] [c0or1k/] [trunk/] [src/] [generic/] [bootmem.c] - Rev 5
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/* * Boot memory allocator * * Copyright (C) 2009 Bahadir Balban */ #include INC_ARCH(linker.h) #include INC_GLUE(memory.h) #include <l4/lib/printk.h> #include <l4/generic/space.h> /* * All memory allocated here is discarded after boot. * Increase this size if bootmem allocations fail. */ #define BOOTMEM_SIZE (SZ_4K * 4) SECTION(".init.bootmem") char bootmem[BOOTMEM_SIZE]; struct address_space init_space; static unsigned long cursor = (unsigned long)&bootmem; unsigned long bootmem_free_pages(void) { return BOOTMEM_SIZE - (page_align_up(cursor) - (unsigned long)&bootmem); } void *alloc_bootmem(int size, int alignment) { void *ptr; /* If alignment is required */ if (alignment) { /* And cursor is not aligned */ if (!is_aligned(cursor, alignment)) /* Align the cursor to alignment */ cursor = align_up(cursor, alignment); /* Align to 4 byte by default */ } else if (size >= 4) { /* And cursor is not aligned */ if (!is_aligned(cursor, 4)) /* Align the cursor to alignment */ cursor = align_up(cursor, 4); } /* Allocate from cursor */ ptr = (void *)cursor; /* Update cursor */ cursor += size; /* Check if cursor is passed bootmem area */ if (cursor >= (unsigned long)&bootmem[BOOTMEM_SIZE]) { printk("Fatal: Insufficient boot memory.\n"); BUG(); } return ptr; } pmd_table_t *alloc_boot_pmd(void) { return alloc_bootmem(sizeof(pmd_table_t), sizeof(pmd_table_t)); }
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