Release 4.14 arch/mips/dec/prom/memory.c
// SPDX-License-Identifier: GPL-2.0
/*
* memory.c: memory initialisation code.
*
* Copyright (C) 1998 Harald Koerfgen, Frieder Streffer and Paul M. Antoine
* Copyright (C) 2000, 2002 Maciej W. Rozycki
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/types.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/dec/machtype.h>
#include <asm/dec/prom.h>
#include <asm/page.h>
#include <asm/sections.h>
volatile unsigned long mem_err;
/* So we know an error occurred */
/*
* Probe memory in 4MB chunks, waiting for an error to tell us we've fallen
* off the end of real memory. Only suitable for the 2100/3100's (PMAX).
*/
#define CHUNK_SIZE 0x400000
static inline void pmax_setup_memory_region(void)
{
volatile unsigned char *memory_page, dummy;
char old_handler[0x80];
extern char genexcept_early;
/* Install exception handler */
memcpy(&old_handler, (void *)(CKSEG0 + 0x80), 0x80);
memcpy((void *)(CKSEG0 + 0x80), &genexcept_early, 0x80);
/* read unmapped and uncached (KSEG1)
* DECstations have at least 4MB RAM
* Assume less than 480MB of RAM, as this is max for 5000/2xx
* FIXME this should be replaced by the first free page!
*/
for (memory_page = (unsigned char *)CKSEG1 + CHUNK_SIZE;
mem_err == 0 && memory_page < (unsigned char *)CKSEG1 + 0x1e00000;
memory_page += CHUNK_SIZE) {
dummy = *memory_page;
}
memcpy((void *)(CKSEG0 + 0x80), &old_handler, 0x80);
add_memory_region(0, (unsigned long)memory_page - CKSEG1 - CHUNK_SIZE,
BOOT_MEM_RAM);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 120 | 86.33% | 2 | 40.00% |
| Linus Torvalds | 11 | 7.91% | 1 | 20.00% |
| Maciej W. Rozycki | 7 | 5.04% | 1 | 20.00% |
| Ralf Bächle | 1 | 0.72% | 1 | 20.00% |
| Total | 139 | 100.00% | 5 | 100.00% |
/*
* Use the REX prom calls to get hold of the memory bitmap, and thence
* determine memory size.
*/
static inline void rex_setup_memory_region(void)
{
int i, bitmap_size;
unsigned long mem_start = 0, mem_size = 0;
memmap *bm;
/* some free 64k */
bm = (memmap *)CKSEG0ADDR(0x28000);
bitmap_size = rex_getbitmap(bm);
for (i = 0; i < bitmap_size; i++) {
/* FIXME: very simplistically only add full sets of pages */
if (bm->bitmap[i] == 0xff)
mem_size += (8 * bm->pagesize);
else if (!mem_size)
mem_start += (8 * bm->pagesize);
else {
add_memory_region(mem_start, mem_size, BOOT_MEM_RAM);
mem_start += mem_size + (8 * bm->pagesize);
mem_size = 0;
}
}
if (mem_size)
add_memory_region(mem_start, mem_size, BOOT_MEM_RAM);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 90 | 63.83% | 3 | 50.00% |
| Linus Torvalds | 46 | 32.62% | 1 | 16.67% |
| Ralf Bächle | 4 | 2.84% | 1 | 16.67% |
| Maciej W. Rozycki | 1 | 0.71% | 1 | 16.67% |
| Total | 141 | 100.00% | 6 | 100.00% |
void __init prom_meminit(u32 magic)
{
if (!prom_is_rex(magic))
pmax_setup_memory_region();
else
rex_setup_memory_region();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 14 | 58.33% | 1 | 25.00% |
| Linus Torvalds (pre-git) | 5 | 20.83% | 2 | 50.00% |
| Ralf Bächle | 5 | 20.83% | 1 | 25.00% |
| Total | 24 | 100.00% | 4 | 100.00% |
void __init prom_free_prom_memory(void)
{
unsigned long end;
/*
* Free everything below the kernel itself but leave
* the first page reserved for the exception handlers.
*/
#if IS_ENABLED(CONFIG_DECLANCE)
/*
* Leave 128 KB reserved for Lance memory for
* IOASIC DECstations.
*
* XXX: save this address for use in dec_lance.c?
*/
if (IOASIC)
end = __pa(&_text) - 0x00020000;
else
#endif
end = __pa(&_text);
free_init_pages("unused PROM memory", PAGE_SIZE, end);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 39 | 72.22% | 2 | 33.33% |
| Ralf Bächle | 6 | 11.11% | 1 | 16.67% |
| Linus Torvalds | 4 | 7.41% | 1 | 16.67% |
| Atsushi Nemoto | 4 | 7.41% | 1 | 16.67% |
| Florian Fainelli | 1 | 1.85% | 1 | 16.67% |
| Total | 54 | 100.00% | 6 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 284 | 70.12% | 3 | 27.27% |
| Linus Torvalds | 79 | 19.51% | 2 | 18.18% |
| Ralf Bächle | 27 | 6.67% | 1 | 9.09% |
| Maciej W. Rozycki | 9 | 2.22% | 2 | 18.18% |
| Atsushi Nemoto | 4 | 0.99% | 1 | 9.09% |
| Florian Fainelli | 1 | 0.25% | 1 | 9.09% |
| Greg Kroah-Hartman | 1 | 0.25% | 1 | 9.09% |
| Total | 405 | 100.00% | 11 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.