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bootvx: x86: Prepare e820 related stuff from the given kernel memory base address

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At present two environment variables 'e820data'/'e820info' are required
to boot a VxWorks x86 kernel, but this is superfluous. The offset of
these two tables are actually at a fixed offset from the kernel memory
base address and we can provide the kernel memory base address to U-Boot
via only one variable 'vx_phys_mem_base'.

Note as it name indicates, the physical address should be provided.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
This commit is contained in:
Bin Meng 2018-04-11 22:02:07 -07:00
parent 2ad3d088d2
commit 2902be86c1
3 changed files with 22 additions and 26 deletions
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20
cmd/elf.c
View file

@ -209,6 +209,7 @@ int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
char build_buf[128]; /* Buffer for building the bootline */
int ptr = 0;
#ifdef CONFIG_X86
ulong base;
struct e820info *info;
struct e820entry *data;
#endif
@ -335,25 +336,18 @@ int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#ifdef CONFIG_X86
/*
* Since E820 information is critical to the kernel, if we don't
* specify these in the environments, use a default one.
* Get VxWorks's physical memory base address from environment,
* if we don't specify it in the environment, use a default one.
*/
tmp = env_get("e820data");
if (tmp)
data = (struct e820entry *)simple_strtoul(tmp, NULL, 16);
else
data = (struct e820entry *)VXWORKS_E820_DATA_ADDR;
tmp = env_get("e820info");
if (tmp)
info = (struct e820info *)simple_strtoul(tmp, NULL, 16);
else
info = (struct e820info *)VXWORKS_E820_INFO_ADDR;
base = env_get_hex("vx_phys_mem_base", VXWORKS_PHYS_MEM_BASE);
data = (struct e820entry *)(base + E820_DATA_OFFSET);
info = (struct e820info *)(base + E820_INFO_OFFSET);
memset(info, 0, sizeof(struct e820info));
info->sign = E820_SIGNATURE;
info->entries = install_e820_map(E820MAX, data);
info->addr = (info->entries - 1) * sizeof(struct e820entry) +
VXWORKS_E820_DATA_ADDR;
E820_DATA_OFFSET;
#endif
/*

16
doc/README.vxworks
View file

@ -67,17 +67,13 @@ look like VxWorks hangs somewhere as nothing outputs on the serial console.
x86-specific information
------------------------
Before loading an x86 kernel, two additional environment variables need to be
provided. They are "e820data" and "e820info", which represent the address of
E820 table and E820 information (defined by VxWorks) in system memory.
Before loading an x86 kernel, one additional environment variable need to be
provided. This is "vx_phys_mem_base", which represent the physical memory
base address of VxWorks.
Check VxWorks kernel configuration to look for BIOS_E820_DATA_START and
BIOS_E820_INFO_START, and assign their values to "e820data" and "e820info"
accordingly. If neither of these two are supplied, U-Boot assumes a default
location at 0x4000 for "e820data" and 0x4a00 for "e820info". Typical values
for "e820data" and "e820info" are 0x104000 and 0x104a00. But there is one
exception on Intel Galileo, where "e820data" and "e820info" should be left
unset, which assume the default location for VxWorks.
Check VxWorks kernel configuration to look for LOCAL_MEM_LOCAL_ADRS. For
VxWorks 7, this is normally a virtual address and you need find out its
corresponding physical address and assign its value to "vx_phys_mem_base".
For boards on which ACPI is not supported by U-Boot yet, VxWorks kernel must
be configured to use MP table and virtual wire interrupt mode. This requires

12
include/vxworks.h
View file

@ -8,10 +8,16 @@
#ifndef _VXWORKS_H_
#define _VXWORKS_H_
/*
* Physical address of memory base for VxWorks x86
* This is LOCAL_MEM_LOCAL_ADRS in the VxWorks kernel configuration.
*/
#define VXWORKS_PHYS_MEM_BASE 0x100000
/*
* VxWorks x86 E820 related stuff
*
* VxWorks on x86 gets E820 information from pre-defined address @
* VxWorks on x86 gets E820 information from pre-defined offset @
* 0x4a00 and 0x4000. At 0x4a00 it's an information table defined
* by VxWorks and the actual E820 table entries starts from 0x4000.
* As defined by the BIOS E820 spec, the maximum number of E820 table
@ -20,8 +26,8 @@
* information that is retrieved from the BIOS E820 call and saved
* later for sanity test during the kernel boot-up.
*/
#define VXWORKS_E820_DATA_ADDR 0x4000
#define VXWORKS_E820_INFO_ADDR 0x4a00
#define E820_DATA_OFFSET 0x4000
#define E820_INFO_OFFSET 0x4a00
/* E820 info signatiure "SMAP" - System MAP */
#define E820_SIGNATURE 0x534d4150