cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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setup.c (2798B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
      3
      4#include <linux/console.h>
      5#include <linux/memblock.h>
      6#include <linux/initrd.h>
      7#include <linux/of.h>
      8#include <linux/of_fdt.h>
      9#include <linux/start_kernel.h>
     10#include <linux/dma-map-ops.h>
     11#include <linux/screen_info.h>
     12#include <asm/sections.h>
     13#include <asm/mmu_context.h>
     14#include <asm/pgalloc.h>
     15
     16#ifdef CONFIG_DUMMY_CONSOLE
     17struct screen_info screen_info = {
     18	.orig_video_lines	= 30,
     19	.orig_video_cols	= 80,
     20	.orig_video_mode	= 0,
     21	.orig_video_ega_bx	= 0,
     22	.orig_video_isVGA	= 1,
     23	.orig_video_points	= 8
     24};
     25#endif
     26
     27static void __init csky_memblock_init(void)
     28{
     29	unsigned long lowmem_size = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
     30	unsigned long sseg_size = PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET);
     31	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
     32	signed long size;
     33
     34	memblock_reserve(__pa(_stext), _end - _stext);
     35
     36	early_init_fdt_reserve_self();
     37	early_init_fdt_scan_reserved_mem();
     38
     39	memblock_dump_all();
     40
     41	min_low_pfn = PFN_UP(memblock_start_of_DRAM());
     42	max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM());
     43
     44	size = max_pfn - min_low_pfn;
     45
     46	if (size >= lowmem_size) {
     47		max_low_pfn = min_low_pfn + lowmem_size;
     48#ifdef CONFIG_PAGE_OFFSET_80000000
     49		write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE);
     50#endif
     51	} else if (size > sseg_size) {
     52		max_low_pfn = min_low_pfn + sseg_size;
     53	}
     54
     55	max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
     56
     57	mmu_init(min_low_pfn, max_low_pfn);
     58
     59#ifdef CONFIG_HIGHMEM
     60	max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
     61
     62	highstart_pfn = max_low_pfn;
     63	highend_pfn   = max_pfn;
     64#endif
     65	memblock_set_current_limit(PFN_PHYS(max_low_pfn));
     66
     67	dma_contiguous_reserve(0);
     68
     69	free_area_init(max_zone_pfn);
     70}
     71
     72void __init setup_arch(char **cmdline_p)
     73{
     74	*cmdline_p = boot_command_line;
     75
     76	console_verbose();
     77
     78	pr_info("Phys. mem: %ldMB\n",
     79		(unsigned long) memblock_phys_mem_size()/1024/1024);
     80
     81	setup_initial_init_mm(_stext, _etext, _edata, _end);
     82
     83	parse_early_param();
     84
     85	csky_memblock_init();
     86
     87	unflatten_and_copy_device_tree();
     88
     89#ifdef CONFIG_SMP
     90	setup_smp();
     91#endif
     92
     93	sparse_init();
     94
     95	fixaddr_init();
     96
     97#ifdef CONFIG_HIGHMEM
     98	kmap_init();
     99#endif
    100}
    101
    102unsigned long va_pa_offset;
    103EXPORT_SYMBOL(va_pa_offset);
    104
    105static inline unsigned long read_mmu_msa(void)
    106{
    107#ifdef CONFIG_PAGE_OFFSET_80000000
    108	return read_mmu_msa0();
    109#endif
    110
    111#ifdef CONFIG_PAGE_OFFSET_A0000000
    112	return read_mmu_msa1();
    113#endif
    114}
    115
    116asmlinkage __visible void __init csky_start(unsigned int unused,
    117					    void *dtb_start)
    118{
    119	/* Clean up bss section */
    120	memset(__bss_start, 0, __bss_stop - __bss_start);
    121
    122	va_pa_offset = read_mmu_msa() & ~(SSEG_SIZE - 1);
    123
    124	pre_trap_init();
    125
    126	if (dtb_start == NULL)
    127		early_init_dt_scan(__dtb_start);
    128	else
    129		early_init_dt_scan(dtb_start);
    130
    131	start_kernel();
    132
    133	asm volatile("br .\n");
    134}