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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e817513b1b
For AMP, different kernel instances load into separate memory regions. Read the start of memory from the device tree and limit the memory to what's specified in the device tree. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Tony Breeds <tony@bakeyournoodle.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
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* Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
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*
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* Based on earlier code:
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* Copyright (C) Paul Mackerras 1997.
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*
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* Matt Porter <mporter@kernel.crashing.org>
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* Copyright 2002-2005 MontaVista Software Inc.
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*
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* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
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* Copyright (c) 2003, 2004 Zultys Technologies
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*
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* Copyright 2007 David Gibson, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "types.h"
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#include "elf.h"
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#include "string.h"
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#include "stdio.h"
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#include "page.h"
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#include "ops.h"
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#include "reg.h"
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#include "io.h"
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#include "dcr.h"
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#include "4xx.h"
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#include "44x.h"
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#include "libfdt.h"
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BSS_STACK(4096);
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static u32 ibm4xx_memstart;
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static void iss_4xx_fixups(void)
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{
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void *memory;
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u32 reg[3];
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memory = finddevice("/memory");
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if (!memory)
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fatal("Can't find memory node\n");
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/* This assumes #address-cells = 2, #size-cells =1 and that */
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getprop(memory, "reg", reg, sizeof(reg));
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if (reg[2])
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/* If the device tree specifies the memory range, use it */
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ibm4xx_memstart = reg[1];
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else
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/* othersize, read it from the SDRAM controller */
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ibm4xx_sdram_fixup_memsize();
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}
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static void *iss_4xx_vmlinux_alloc(unsigned long size)
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{
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return (void *)ibm4xx_memstart;
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}
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#define SPRN_PIR 0x11E /* Processor Indentification Register */
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void platform_init(void)
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{
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unsigned long end_of_ram = 0x08000000;
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unsigned long avail_ram = end_of_ram - (unsigned long)_end;
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u32 pir_reg;
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simple_alloc_init(_end, avail_ram, 128, 64);
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platform_ops.fixups = iss_4xx_fixups;
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platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
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platform_ops.exit = ibm44x_dbcr_reset;
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pir_reg = mfspr(SPRN_PIR);
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fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
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fdt_init(_dtb_start);
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serial_console_init();
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}
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