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// SPDX-License-Identifier: GPL-2.0
/*
* (C) 2013
* David Feng <fenghua@phytium.com.cn>
* Sharma Bhupesh <bhupesh.sharma@freescale.com>
*
* (C) 2020 EPAM Systems Inc
*/
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <xen.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/armv8/mmu.h>
#include <asm/xen.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/system.h>
#include <linux/compiler.h>
#include <xen/gnttab.h>
#include <xen/hvm.h>
DECLARE_GLOBAL_DATA_PTR;
int board_init(void)
{
return 0;
}
/*
* Use fdt provided by Xen: according to
* https://www.kernel.org/doc/Documentation/arm64/booting.txt
* x0 is the physical address of the device tree blob (dtb) in system RAM.
* This is stored in rom_pointer during low level init.
*/
void *board_fdt_blob_setup(void)
{
if (fdt_magic(rom_pointer[0]) != FDT_MAGIC)
return NULL;
return (void *)rom_pointer[0];
}
#define MAX_MEM_MAP_REGIONS 5
static struct mm_region xen_mem_map[MAX_MEM_MAP_REGIONS];
struct mm_region *mem_map = xen_mem_map;
static int get_next_memory_node(const void *blob, int mem)
{
do {
mem = fdt_node_offset_by_prop_value(blob, mem,
"device_type", "memory", 7);
} while (!fdtdec_get_is_enabled(blob, mem));
return mem;
}
static int setup_mem_map(void)
{
int i = 0, ret, mem, reg = 0;
struct fdt_resource res;
const void *blob = gd->fdt_blob;
u64 gfn;
phys_addr_t gnttab_base;
phys_size_t gnttab_sz;
/*
* Add "magic" region which is used by Xen to provide some essentials
* for the guest: we need console and xenstore.
*/
ret = hvm_get_parameter_maintain_dcache(HVM_PARAM_CONSOLE_PFN, &gfn);
if (ret < 0) {
printf("%s: Can't get HVM_PARAM_CONSOLE_PFN, ret %d\n",
__func__, ret);
return -EINVAL;
}
xen_mem_map[i].virt = PFN_PHYS(gfn);
xen_mem_map[i].phys = PFN_PHYS(gfn);
xen_mem_map[i].size = PAGE_SIZE;
xen_mem_map[i].attrs = (PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_INNER_SHARE);
i++;
ret = hvm_get_parameter_maintain_dcache(HVM_PARAM_STORE_PFN, &gfn);
if (ret < 0) {
printf("%s: Can't get HVM_PARAM_STORE_PFN, ret %d\n",
__func__, ret);
return -EINVAL;
}
xen_mem_map[i].virt = PFN_PHYS(gfn);
xen_mem_map[i].phys = PFN_PHYS(gfn);
xen_mem_map[i].size = PAGE_SIZE;
xen_mem_map[i].attrs = (PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_INNER_SHARE);
i++;
/* Get Xen's suggested physical page assignments for the grant table. */
get_gnttab_base(&gnttab_base, &gnttab_sz);
xen_mem_map[i].virt = gnttab_base;
xen_mem_map[i].phys = gnttab_base;
xen_mem_map[i].size = gnttab_sz;
xen_mem_map[i].attrs = (PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_INNER_SHARE);
i++;
mem = get_next_memory_node(blob, -1);
if (mem < 0) {
printf("%s: Missing /memory node\n", __func__);
return -EINVAL;
}
for (; i < MAX_MEM_MAP_REGIONS; i++) {
ret = fdt_get_resource(blob, mem, "reg", reg++, &res);
if (ret == -FDT_ERR_NOTFOUND) {
reg = 0;
mem = get_next_memory_node(blob, mem);
if (mem == -FDT_ERR_NOTFOUND)
break;
ret = fdt_get_resource(blob, mem, "reg", reg++, &res);
if (ret == -FDT_ERR_NOTFOUND)
break;
}
if (ret != 0) {
printf("No reg property for memory node\n");
return -EINVAL;
}
xen_mem_map[i].virt = (phys_addr_t)res.start;
xen_mem_map[i].phys = (phys_addr_t)res.start;
xen_mem_map[i].size = (phys_size_t)(res.end - res.start + 1);
xen_mem_map[i].attrs = (PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_INNER_SHARE);
}
return 0;
}
void enable_caches(void)
{
/* Re-setup the memory map as BSS gets cleared after relocation. */
setup_mem_map();
icache_enable();
dcache_enable();
}
/* Read memory settings from the Xen provided device tree. */
int dram_init(void)
{
int ret;
ret = fdtdec_setup_mem_size_base();
if (ret < 0)
return ret;
/* Setup memory map, so MMU page table size can be estimated. */
return setup_mem_map();
}
int dram_init_banksize(void)
{
return fdtdec_setup_memory_banksize();
}
/*
* Board specific reset that is system reset.
*/
void reset_cpu(void)
{
}
int ft_system_setup(void *blob, struct bd_info *bd)
{
return 0;
}
int ft_board_setup(void *blob, struct bd_info *bd)
{
return 0;
}
int print_cpuinfo(void)
{
printf("Xen virtual CPU\n");
return 0;
}
void board_cleanup_before_linux(void)
{
xen_fini();
}
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