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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | /* ** linux/amiga/chipram.c ** ** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org> ** - 64-bit aligned allocations for full AGA compatibility ** ** Rewritten 15/9/2000 by Geert to use resource management */ #include <linux/config.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/slab.h> #include <asm/amigahw.h> unsigned long amiga_chip_size; static struct resource chipram_res = { "Chip RAM", CHIP_PHYSADDR }; static unsigned long chipavail; void __init amiga_chip_init(void) { if (!AMIGAHW_PRESENT(CHIP_RAM)) return; #ifndef CONFIG_APUS_FAST_EXCEPT /* * Remove the first 4 pages where PPC exception handlers will be located */ amiga_chip_size -= 0x4000; #endif chipram_res.end = amiga_chip_size-1; request_resource(&iomem_resource, &chipram_res); chipavail = amiga_chip_size; } void *amiga_chip_alloc(unsigned long size, const char *name) { struct resource *res; /* round up */ size = PAGE_ALIGN(size); #ifdef DEBUG printk("amiga_chip_alloc: allocate %ld bytes\n", size); #endif res = kmalloc(sizeof(struct resource), GFP_KERNEL); if (!res) return NULL; memset(res, 0, sizeof(struct resource)); res->name = name; if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) { kfree(res); return NULL; } chipavail -= size; #ifdef DEBUG printk("amiga_chip_alloc: returning %lx\n", res->start); #endif return (void *)ZTWO_VADDR(res->start); } /* * Warning: * amiga_chip_alloc_res is meant only for drivers that need to allocate * Chip RAM before kmalloc() is functional. As a consequence, those * drivers must not free that Chip RAM afterwards. */ void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res) { unsigned long start; /* round up */ size = PAGE_ALIGN(size); /* dmesg into chipmem prefers memory at the safe end */ start = CHIP_PHYSADDR + chipavail - size; #ifdef DEBUG printk("amiga_chip_alloc_res: allocate %ld bytes\n", size); #endif if (allocate_resource(&chipram_res, res, size, start, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) { printk("amiga_chip_alloc_res: first alloc failed!\n"); if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) return NULL; } chipavail -= size; #ifdef DEBUG printk("amiga_chip_alloc_res: returning %lx\n", res->start); #endif return (void *)ZTWO_VADDR(res->start); } void amiga_chip_free(void *ptr) { unsigned long start = ZTWO_PADDR(ptr); struct resource **p, *res; unsigned long size; for (p = &chipram_res.child; (res = *p); p = &res->sibling) { if (res->start != start) continue; *p = res->sibling; size = res->end-start; #ifdef DEBUG printk("amiga_chip_free: free %ld bytes at %p\n", size, ptr); #endif chipavail += size; kfree(res); return; } printk("amiga_chip_free: trying to free nonexistent region at %p\n", ptr); } unsigned long amiga_chip_avail(void) { #ifdef DEBUG printk("amiga_chip_avail : %ld bytes\n", chipavail); #endif return chipavail; } |