void __init
adjust_total_lowmem(void)
{
- phys_addr_t max_lowmem_size = __max_low_memory;
- phys_addr_t cam_max_size = 0x10000000;
phys_addr_t ram;
+ unsigned int max_cam = 28; /* 2^28 = 256 Mb */
+ char buf[ARRAY_SIZE(cam) * 5 + 1], *p = buf;
+ int i;
- /* adjust CAM size to max_lowmem_size */
- if (max_lowmem_size < cam_max_size)
- cam_max_size = max_lowmem_size;
-
- /* adjust lowmem size to max_lowmem_size */
- ram = min(max_lowmem_size, total_lowmem);
+ /* adjust lowmem size to __max_low_memory */
+ ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
/* Calculate CAM values */
- __cam0 = 1UL << 2 * (__ilog2(ram) / 2);
- if (__cam0 > cam_max_size)
- __cam0 = cam_max_size;
- ram -= __cam0;
- if (ram) {
- __cam1 = 1UL << 2 * (__ilog2(ram) / 2);
- if (__cam1 > cam_max_size)
- __cam1 = cam_max_size;
- ram -= __cam1;
- }
- if (ram) {
- __cam2 = 1UL << 2 * (__ilog2(ram) / 2);
- if (__cam2 > cam_max_size)
- __cam2 = cam_max_size;
- ram -= __cam2;
+ __max_low_memory = 0;
+ for (i = 0; ram && i < ARRAY_SIZE(cam); i++) {
+ unsigned int camsize = __ilog2(ram) & ~1U;
+ if (camsize > max_cam)
+ camsize = max_cam;
+ cam[i] = 1UL << camsize;
+ ram -= cam[i];
+ __max_low_memory += cam[i];
+
+ p += sprintf(p, "%lu/", cam[i] >> 20);
}
+ for (; i < ARRAY_SIZE(cam); i++)
+ p += sprintf(p, "0/");
+ p[-1] = '\0';
this all seems like overkill. Can we use string_get_size() from lib/
string_helpers.c and just printf in a loop?
- printk(KERN_INFO "Memory CAM mapping: CAM0=%ldMb, CAM1=%ldMb,"
- " CAM2=%ldMb residual: %ldMb\n",
- __cam0 >> 20, __cam1 >> 20, __cam2 >> 20,
- (long int)((total_lowmem - __cam0 - __cam1 - __cam2)
- >> 20));
- __max_low_memory = __cam0 + __cam1 + __cam2;
+ pr_info("Memory CAM mapping: %s Mb, residual: %ldMb\n", buf,
+ (total_lowmem - __max_low_memory) >> 20);
__initial_memory_limit_addr = memstart_addr + __max_low_memory;
}
- k
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