1 // SPDX-License-Identifier: GPL-2.0
4 * David Feng <fenghua@phytium.com.cn>
5 * Sharma Bhupesh <bhupesh.sharma@freescale.com>
7 * (C) 2020 EPAM Systems Inc
17 #include <asm/armv8/mmu.h>
19 #include <asm/xen/hypercall.h>
20 #include <asm/xen/system.h>
22 #include <linux/compiler.h>
26 DECLARE_GLOBAL_DATA_PTR;
34 * Use fdt provided by Xen: according to
35 * https://www.kernel.org/doc/Documentation/arm64/booting.txt
36 * x0 is the physical address of the device tree blob (dtb) in system RAM.
37 * This is stored in rom_pointer during low level init.
39 void *board_fdt_blob_setup(void)
41 if (fdt_magic(rom_pointer[0]) != FDT_MAGIC)
43 return (void *)rom_pointer[0];
46 #define MAX_MEM_MAP_REGIONS 5
47 static struct mm_region xen_mem_map[MAX_MEM_MAP_REGIONS];
48 struct mm_region *mem_map = xen_mem_map;
50 static int get_next_memory_node(const void *blob, int mem)
53 mem = fdt_node_offset_by_prop_value(blob, mem,
54 "device_type", "memory", 7);
55 } while (!fdtdec_get_is_enabled(blob, mem));
60 static int setup_mem_map(void)
62 int i = 0, ret, mem, reg = 0;
63 struct fdt_resource res;
64 const void *blob = gd->fdt_blob;
68 * Add "magic" region which is used by Xen to provide some essentials
69 * for the guest: we need console.
71 ret = hvm_get_parameter_maintain_dcache(HVM_PARAM_CONSOLE_PFN, &gfn);
73 printf("%s: Can't get HVM_PARAM_CONSOLE_PFN, ret %d\n",
78 xen_mem_map[i].virt = PFN_PHYS(gfn);
79 xen_mem_map[i].phys = PFN_PHYS(gfn);
80 xen_mem_map[i].size = PAGE_SIZE;
81 xen_mem_map[i].attrs = (PTE_BLOCK_MEMTYPE(MT_NORMAL) |
82 PTE_BLOCK_INNER_SHARE);
85 mem = get_next_memory_node(blob, -1);
87 printf("%s: Missing /memory node\n", __func__);
91 for (; i < MAX_MEM_MAP_REGIONS; i++) {
92 ret = fdt_get_resource(blob, mem, "reg", reg++, &res);
93 if (ret == -FDT_ERR_NOTFOUND) {
95 mem = get_next_memory_node(blob, mem);
96 if (mem == -FDT_ERR_NOTFOUND)
99 ret = fdt_get_resource(blob, mem, "reg", reg++, &res);
100 if (ret == -FDT_ERR_NOTFOUND)
104 printf("No reg property for memory node\n");
108 xen_mem_map[i].virt = (phys_addr_t)res.start;
109 xen_mem_map[i].phys = (phys_addr_t)res.start;
110 xen_mem_map[i].size = (phys_size_t)(res.end - res.start + 1);
111 xen_mem_map[i].attrs = (PTE_BLOCK_MEMTYPE(MT_NORMAL) |
112 PTE_BLOCK_INNER_SHARE);
117 void enable_caches(void)
119 /* Re-setup the memory map as BSS gets cleared after relocation. */
125 /* Read memory settings from the Xen provided device tree. */
130 ret = fdtdec_setup_mem_size_base();
133 /* Setup memory map, so MMU page table size can be estimated. */
134 return setup_mem_map();
137 int dram_init_banksize(void)
139 return fdtdec_setup_memory_banksize();
143 * Board specific reset that is system reset.
145 void reset_cpu(ulong addr)
149 int ft_system_setup(void *blob, struct bd_info *bd)
154 int ft_board_setup(void *blob, struct bd_info *bd)
159 int board_early_init_f(void)
164 int print_cpuinfo(void)
166 printf("Xen virtual CPU\n");