blob: 1d85e9bf783cf907ba1e0ef17a0d529c1f9f5cb6 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Chen Liqin <liqin.chen@sunplusct.com>
* Lennox Wu <lennox.wu@sunplusct.com>
* Copyright (C) 2012 Regents of the University of California
* Copyright (C) 2020 FORTH-ICS/CARV
* Nick Kossifidis <mick@ics.forth.gr>
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/sched.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/sched/task.h>
#include <linux/swiotlb.h>
#include <linux/smp.h>
#include <linux/efi.h>
#include <asm/cpu_ops.h>
#include <asm/early_ioremap.h>
#include <asm/setup.h>
#include <asm/set_memory.h>
#include <asm/sections.h>
#include <asm/sbi.h>
#include <asm/tlbflush.h>
#include <asm/thread_info.h>
#include <asm/kasan.h>
#include <asm/efi.h>
#include "head.h"
#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
struct screen_info screen_info __section(".data") = {
.orig_video_lines = 30,
.orig_video_cols = 80,
.orig_video_mode = 0,
.orig_video_ega_bx = 0,
.orig_video_isVGA = 1,
.orig_video_points = 8
};
#endif
/*
* The lucky hart to first increment this variable will boot the other cores.
* This is used before the kernel initializes the BSS so it can't be in the
* BSS.
*/
atomic_t hart_lottery __section(".sdata");
unsigned long boot_cpu_hartid;
static DEFINE_PER_CPU(struct cpu, cpu_devices);
/*
* Place kernel memory regions on the resource tree so that
* kexec-tools can retrieve them from /proc/iomem. While there
* also add "System RAM" regions for compatibility with other
* archs, and the rest of the known regions for completeness.
*/
static struct resource code_res = { .name = "Kernel code", };
static struct resource data_res = { .name = "Kernel data", };
static struct resource rodata_res = { .name = "Kernel rodata", };
static struct resource bss_res = { .name = "Kernel bss", };
static int __init add_resource(struct resource *parent,
struct resource *res)
{
int ret = 0;
ret = insert_resource(parent, res);
if (ret < 0) {
pr_err("Failed to add a %s resource at %llx\n",
res->name, (unsigned long long) res->start);
return ret;
}
return 1;
}
static int __init add_kernel_resources(struct resource *res)
{
int ret = 0;
/*
* The memory region of the kernel image is continuous and
* was reserved on setup_bootmem, find it here and register
* it as a resource, then register the various segments of
* the image as child nodes
*/
if (!(res->start <= code_res.start && res->end >= data_res.end))
return 0;
res->name = "Kernel image";
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
/*
* We removed a part of this region on setup_bootmem so
* we need to expand the resource for the bss to fit in.
*/
res->end = bss_res.end;
ret = add_resource(&iomem_resource, res);
if (ret < 0)
return ret;
ret = add_resource(res, &code_res);
if (ret < 0)
return ret;
ret = add_resource(res, &rodata_res);
if (ret < 0)
return ret;
ret = add_resource(res, &data_res);
if (ret < 0)
return ret;
ret = add_resource(res, &bss_res);
return ret;
}
static void __init init_resources(void)
{
struct memblock_region *region = NULL;
struct resource *res = NULL;
int ret = 0;
code_res.start = __pa_symbol(_text);
code_res.end = __pa_symbol(_etext) - 1;
code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
rodata_res.start = __pa_symbol(__start_rodata);
rodata_res.end = __pa_symbol(__end_rodata) - 1;
rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
data_res.start = __pa_symbol(_data);
data_res.end = __pa_symbol(_edata) - 1;
data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
bss_res.start = __pa_symbol(__bss_start);
bss_res.end = __pa_symbol(__bss_stop) - 1;
bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
/*
* Start by adding the reserved regions, if they overlap
* with /memory regions, insert_resource later on will take
* care of it.
*/
for_each_reserved_mem_region(region) {
res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
if (!res)
panic("%s: Failed to allocate %zu bytes\n", __func__,
sizeof(struct resource));
res->name = "Reserved";
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
ret = add_kernel_resources(res);
if (ret < 0)
goto error;
else if (ret)
continue;
/*
* Ignore any other reserved regions within
* system memory.
*/
if (memblock_is_memory(res->start))
continue;
ret = add_resource(&iomem_resource, res);
if (ret < 0)
goto error;
}
/* Add /memory regions to the resource tree */
for_each_mem_region(region) {
res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
if (!res)
panic("%s: Failed to allocate %zu bytes\n", __func__,
sizeof(struct resource));
if (unlikely(memblock_is_nomap(region))) {
res->name = "Reserved";
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
} else {
res->name = "System RAM";
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
}
res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
ret = add_resource(&iomem_resource, res);
if (ret < 0)
goto error;
}
return;
error:
memblock_free((phys_addr_t) res, sizeof(struct resource));
/* Better an empty resource tree than an inconsistent one */
release_child_resources(&iomem_resource);
}
static void __init parse_dtb(void)
{
/* Early scan of device tree from init memory */
if (early_init_dt_scan(dtb_early_va))
return;
pr_err("No DTB passed to the kernel\n");
#ifdef CONFIG_CMDLINE_FORCE
strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
pr_info("Forcing kernel command line to: %s\n", boot_command_line);
#endif
}
void __init setup_arch(char **cmdline_p)
{
parse_dtb();
init_mm.start_code = (unsigned long) _stext;
init_mm.end_code = (unsigned long) _etext;
init_mm.end_data = (unsigned long) _edata;
init_mm.brk = (unsigned long) _end;
*cmdline_p = boot_command_line;
early_ioremap_setup();
jump_label_init();
parse_early_param();
efi_init();
setup_bootmem();
paging_init();
init_resources();
#if IS_ENABLED(CONFIG_BUILTIN_DTB)
unflatten_and_copy_device_tree();
#else
if (early_init_dt_verify(__va(dtb_early_pa)))
unflatten_device_tree();
else
pr_err("No DTB found in kernel mappings\n");
#endif
if (IS_ENABLED(CONFIG_RISCV_SBI))
sbi_init();
if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
protect_kernel_text_data();
#ifdef CONFIG_SWIOTLB
swiotlb_init(1);
#endif
#ifdef CONFIG_KASAN
kasan_init();
#endif
#ifdef CONFIG_SMP
setup_smp();
#endif
riscv_fill_hwcap();
}
static int __init topology_init(void)
{
int i;
for_each_possible_cpu(i) {
struct cpu *cpu = &per_cpu(cpu_devices, i);
cpu->hotpluggable = cpu_has_hotplug(i);
register_cpu(cpu, i);
}
return 0;
}
subsys_initcall(topology_init);
void free_initmem(void)
{
unsigned long init_begin = (unsigned long)__init_begin;
unsigned long init_end = (unsigned long)__init_end;
set_memory_rw_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT);
free_initmem_default(POISON_FREE_INITMEM);
}