Copy the kernel mappings to the new (user) address environment. The
copyuing is done exactly once. This relies on the fact that the kernel
L1/L2 mappings will never change, as all of the kernel memory is mapped
upon boot.
This implements initial support for kernel build (address environments,
page allocator) for RISC-V.
This is done a bit differently compared to the ARMV7 implementation:
- Support implemented for Sv39 MMU, however the implementation should be
extensible for other MMU types also.
- Instead of preserving and moving the L1 references around, a canonical
approach is used instead, where the page table base address register
is switched upon context switch.
- To preserve a bit of memory, only a single L1/L2 table is supported,
this gives access to 1GiB of virtual memory for each process, which
should be more than enough.
Some things worth noting:
- Assumes page pool is mapped with vaddr=paddr mappings
- The CONFIG_ARCH_XXXX_VBASE and CONFIG_ARCH_XXXX_NPAGES values are
ignored, with the exception of CONFIG_ARCH_DATA_VBASE which is used
for ARCH_DATA_RESERVE
- ARCH_DATA_RESERVE is placed at the beginning of the userspace task's
address environment
According to POSIX the length of the source address of the received
message shall be stored in the object pointed to by the address_len
argument.
This patch fixes two places where this did not happen correctly.
Signed-off-by: Michael Jung <michael.jung@secore.ly>
When device not support byte read or readlen less than
device block size, will use `dev->buffer` as dst address.
`CFGDIOC_FIRSTCONFIG` and `CFGDIOC_NEXTCONFIG` should also
malloc buffer before call `mtdconfig_readbytes`.
Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
common/arm_assert.c:80:14: warning: format specifies type 'unsigned int' but the argument has type 'uint32_t' (aka 'unsigned long') [-Wformat]
stack, ptr[0], ptr[1], ptr[2], ptr[3],
^~~~~
include/debug.h:119:59: note: expanded from macro '_alert'
__arch_syslog(LOG_EMERG, EXTRA_FMT format EXTRA_ARG, ##__VA_ARGS__)
~~~~~~ ^~~~~~~~~~~
Signed-off-by: chao.an <anchao@xiaomi.com>
Summary:
- Cast to unsigned char for strcmp and strncmp
- strcmp and strncmp are described following by opengroup.org
The sign of a non-zero return value shall be determined by the sign
of the difference between the values of the first pair of bytes
(both interpreted as type unsigned char) that differ in the strings
being compared.
https://pubs.opengroup.org/onlinepubs/9699919799/functions/strcmp.htmlhttps://pubs.opengroup.org/onlinepubs/9699919799/functions/strncmp.html
Impact:
- strcmp and strncmp return value
Testing:
- ostest on sabre-6quad:smp w/ qemu
Signed-off-by: Oki Minabe <minabe.oki@gmail.com>
Summary:
- Correct boardctl function's return value
- In case of BOARDIOC_TESTSET, `ret' has 0 or 1 or an error,
but `ret' is ignored except error.
Impact:
- boardctl return value except errors
Testing:
- custom Cortex-A9 board
Signed-off-by: Oki Minabe <minabe.oki@gmail.com>
