mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 01:46:51 +07:00
09b7c9f24d
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/799/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
182 lines
5.3 KiB
C
182 lines
5.3 KiB
C
/*
|
|
* Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
|
|
* Portions copyright (C) 2009 Cisco Systems, Inc.
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* Apparently originally from arch/mips/malta-memory.c. Modified to work
|
|
* with the PowerTV bootloader.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/page.h>
|
|
#include <asm/sections.h>
|
|
|
|
#include <asm/mips-boards/prom.h>
|
|
|
|
#include "init.h"
|
|
|
|
/* Memory constants */
|
|
#define KIBIBYTE(n) ((n) * 1024) /* Number of kibibytes */
|
|
#define MEBIBYTE(n) ((n) * KIBIBYTE(1024)) /* Number of mebibytes */
|
|
#define DEFAULT_MEMSIZE MEBIBYTE(256) /* If no memsize provided */
|
|
#define LOW_MEM_MAX MEBIBYTE(252) /* Max usable low mem */
|
|
#define RES_BOOTLDR_MEMSIZE MEBIBYTE(1) /* Memory reserved for bldr */
|
|
#define BOOT_MEM_SIZE KIBIBYTE(256) /* Memory reserved for bldr */
|
|
#define PHYS_MEM_START 0x10000000 /* Start of physical memory */
|
|
|
|
char __initdata cmdline[COMMAND_LINE_SIZE];
|
|
|
|
void __init prom_meminit(void)
|
|
{
|
|
char *memsize_str;
|
|
unsigned long memsize = 0;
|
|
unsigned int physend;
|
|
char *ptr;
|
|
int low_mem;
|
|
int high_mem;
|
|
|
|
/* Check the command line first for a memsize directive */
|
|
strcpy(cmdline, arcs_cmdline);
|
|
ptr = strstr(cmdline, "memsize=");
|
|
if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
|
|
ptr = strstr(ptr, " memsize=");
|
|
|
|
if (ptr) {
|
|
memsize = memparse(ptr + 8, &ptr);
|
|
} else {
|
|
/* otherwise look in the environment */
|
|
memsize_str = prom_getenv("memsize");
|
|
|
|
if (memsize_str != NULL) {
|
|
pr_info("prom memsize = %s\n", memsize_str);
|
|
memsize = simple_strtol(memsize_str, NULL, 0);
|
|
}
|
|
|
|
if (memsize == 0) {
|
|
if (_prom_memsize != 0) {
|
|
memsize = _prom_memsize;
|
|
pr_info("_prom_memsize = 0x%lx\n", memsize);
|
|
/* add in memory that the bootloader doesn't
|
|
* report */
|
|
memsize += BOOT_MEM_SIZE;
|
|
} else {
|
|
memsize = DEFAULT_MEMSIZE;
|
|
pr_info("Memsize not passed by bootloader, "
|
|
"defaulting to 0x%lx\n", memsize);
|
|
}
|
|
}
|
|
}
|
|
|
|
physend = PFN_ALIGN(&_end) - 0x80000000;
|
|
if (memsize > LOW_MEM_MAX) {
|
|
low_mem = LOW_MEM_MAX;
|
|
high_mem = memsize - low_mem;
|
|
} else {
|
|
low_mem = memsize;
|
|
high_mem = 0;
|
|
}
|
|
|
|
/*
|
|
* TODO: We will use the hard code for memory configuration until
|
|
* the bootloader releases their device tree to us.
|
|
*/
|
|
/*
|
|
* Add the memory reserved for use by the bootloader to the
|
|
* memory map.
|
|
*/
|
|
add_memory_region(PHYS_MEM_START, RES_BOOTLDR_MEMSIZE,
|
|
BOOT_MEM_RESERVED);
|
|
#ifdef CONFIG_HIGHMEM_256_128
|
|
/*
|
|
* Add memory in low for general use by the kernel and its friends
|
|
* (like drivers, applications, etc).
|
|
*/
|
|
add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
|
|
LOW_MEM_MAX - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
|
|
/*
|
|
* Add the memory reserved for reset vector.
|
|
*/
|
|
add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
|
|
/*
|
|
* Add the memory reserved.
|
|
*/
|
|
add_memory_region(0x20000000, MEBIBYTE(1024 + 75), BOOT_MEM_RESERVED);
|
|
/*
|
|
* Add memory in high for general use by the kernel and its friends
|
|
* (like drivers, applications, etc).
|
|
*
|
|
* 75MB is reserved for devices which are using the memory in high.
|
|
*/
|
|
add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
|
|
BOOT_MEM_RAM);
|
|
#elif defined CONFIG_HIGHMEM_128_128
|
|
/*
|
|
* Add memory in low for general use by the kernel and its friends
|
|
* (like drivers, applications, etc).
|
|
*/
|
|
add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
|
|
MEBIBYTE(128) - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
|
|
/*
|
|
* Add the memory reserved.
|
|
*/
|
|
add_memory_region(PHYS_MEM_START + MEBIBYTE(128),
|
|
MEBIBYTE(128 + 1024 + 75), BOOT_MEM_RESERVED);
|
|
/*
|
|
* Add memory in high for general use by the kernel and its friends
|
|
* (like drivers, applications, etc).
|
|
*
|
|
* 75MB is reserved for devices which are using the memory in high.
|
|
*/
|
|
add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
|
|
BOOT_MEM_RAM);
|
|
#else
|
|
/* Add low memory regions for either:
|
|
* - no-highmemory configuration case -OR-
|
|
* - highmemory "HIGHMEM_LOWBANK_ONLY" case
|
|
*/
|
|
/*
|
|
* Add memory for general use by the kernel and its friends
|
|
* (like drivers, applications, etc).
|
|
*/
|
|
add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
|
|
low_mem - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
|
|
/*
|
|
* Add the memory reserved for reset vector.
|
|
*/
|
|
add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
|
|
#endif
|
|
}
|
|
|
|
void __init prom_free_prom_memory(void)
|
|
{
|
|
unsigned long addr;
|
|
int i;
|
|
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
|
|
continue;
|
|
|
|
addr = boot_mem_map.map[i].addr;
|
|
free_init_pages("prom memory",
|
|
addr, addr + boot_mem_map.map[i].size);
|
|
}
|
|
}
|