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lib: utils/serial: Add shared regions for serial drivers

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The serial driver regions used by OpenSBI should be marked as a shared
read-write regions between M-mode and SU-mode as those are accessed
by earlycon and the corresponding tty serial drivers running in 'S' mode.
When the smepmp extension is enabled, PMP entries for these shared regions
will get programmed.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Mayuresh Chitale
2023-09-07 17:19:46 +05:30
committed by Anup Patel
parent 73aea28264
commit e8bc1621c6
3 changed files with 20 additions and 2 deletions
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7
lib/utils/serial/uart8250.c
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@@ -7,8 +7,10 @@
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/riscv_asm.h>
#include <sbi/riscv_io.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_domain.h>
#include <sbi_utils/serial/uart8250.h>
/* clang-format off */
@@ -133,5 +135,8 @@ int uart8250_init(unsigned long base, u32 in_freq, u32 baudrate, u32 reg_shift,
sbi_console_set_device(&uart8250_console);
return 0;
return sbi_domain_root_add_memrange(base + reg_offset, PAGE_SIZE,
PAGE_SIZE,
(SBI_DOMAIN_MEMREGION_MMIO |
SBI_DOMAIN_MEMREGION_SHARED_SURW_MRW));
}