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/*
* Copyright (c) 2006-2025 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-07-04 rcitach init ver.
* 2025-04-22 ScuDays Add VDSO functionality under the riscv64 architecture.
*/
#include <rtthread.h>
#include <mmu.h>
#include <lwp_user_mm.h>
#include "vdso.h"
#include "vdso_datapage.h"
#define DBG_TAG "vdso"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
enum vdso_abi
{
VDSO_ABI_COMMON,
};
enum vvar_pages
{
VVAR_DATA_PAGE_OFFSET,
VVAR_TIMENS_PAGE_OFFSET,
VVAR_NR_PAGES,
};
struct vdso_abi_info
{
const char *name;
const char *vdso_code_start;
const char *vdso_code_end;
unsigned long vdso_pages;
};
static struct vdso_abi_info vdso_info[] = {
[VDSO_ABI_COMMON] = {
.name = "vdso_common",
.vdso_code_start = __vdso_text_start,
.vdso_code_end = __vdso_text_end,
},
};
static union {
struct vdso_data data[CS_BASES];
uint8_t page[ARCH_PAGE_SIZE];
} vdso_data_store __page_aligned_data;
struct vdso_data *vdso_data = vdso_data_store.data;
int init_ret_flag = RT_EOK;
static int __setup_additional_pages(enum vdso_abi abi, struct rt_lwp *lwp)
{
RT_ASSERT(lwp != RT_NULL);
int ret;
void *vdso_base = RT_NULL;
unsigned long vdso_data_len, vdso_text_len;
vdso_data_len = VVAR_NR_PAGES * ARCH_PAGE_SIZE;
vdso_text_len = vdso_info[abi].vdso_pages << ARCH_PAGE_SHIFT;
vdso_base = lwp_map_user_phy(lwp, RT_NULL, rt_kmem_v2p((void *)vdso_data), vdso_data_len, 0);
if (vdso_base != RT_NULL)
{
ret = RT_EOK;
}
else
{
ret = RT_ERROR;
}
vdso_base += vdso_data_len;
vdso_base = lwp_map_user_phy(lwp, vdso_base, rt_kmem_v2p((void *)vdso_info[abi].vdso_code_start), vdso_text_len, 0);
lwp->vdso_vbase = vdso_base;
return ret;
}
int arch_setup_additional_pages(struct rt_lwp *lwp)
{
int ret;
if (init_ret_flag != RT_EOK) return -RT_ERROR;
ret = __setup_additional_pages(VDSO_ABI_COMMON, lwp);
return ret;
}
static void __initdata(void)
{
struct tm time_vdso = SOFT_RTC_VDSOTIME_DEFAULT;
vdso_data->realtime_initdata = timegm(&time_vdso);
}
static int validate_vdso_elf(void)
{
if (rt_memcmp(vdso_info[VDSO_ABI_COMMON].vdso_code_start, ELF_HEAD, ELF_HEAD_LEN))
{
LOG_E("vDSO is not a valid ELF object!");
init_ret_flag = -RT_ERROR;
return -RT_ERROR;
}
vdso_info[VDSO_ABI_COMMON].vdso_pages = (vdso_info[VDSO_ABI_COMMON].vdso_code_end - vdso_info[VDSO_ABI_COMMON].vdso_code_start) >> ARCH_PAGE_SHIFT;
__initdata();
return RT_EOK;
}
INIT_COMPONENT_EXPORT(validate_vdso_elf);
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