/* Hook for machine specific memory setup. * * This is included late in kernel/setup.c so that it can make use of all of * the static functions. */#define MB (1024 * 1024)unsigned long sgivwfb_mem_phys;unsigned long sgivwfb_mem_size;long long mem_size __initdata = 0;static char * __init machine_specific_memory_setup(void){	long long gfx_mem_size = 8 * MB;	mem_size = ALT_MEM_K;	if (!mem_size) {		printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");		mem_size = 128 * MB;	}	/*	 * this hardcodes the graphics memory to 8 MB	 * it really should be sized dynamically (or at least	 * set as a boot param)	 */	if (!sgivwfb_mem_size) {		printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");		sgivwfb_mem_size = 8 * MB;	}	/*	 * Trim to nearest MB	 */	sgivwfb_mem_size &= ~((1 << 20) - 1);	sgivwfb_mem_phys = mem_size - gfx_mem_size;	add_memory_region(0, LOWMEMSIZE(), E820_RAM);	add_memory_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);	add_memory_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);	return "PROM";	/* Remove gcc warnings */	(void) sanitize_e820_map(NULL, NULL);	(void) copy_e820_map(NULL, 0);}