[PATCH v3 0/5] Split RX and RW regions for separate pmp entries

[Himanshu Chauhan]

This is second installment of the patch series sent earlier with
the subject:  Split region permissions into M-mode and SU-mode. The
version 2 was recently posted, for which below is the link:
http://lists.infradead.org/pipermail/opensbi/2023-January/004127.html

This patch series splits the RX (text and read-only data) and RW data regions
so that each can have its independent pmp entries with correct permissions.
The linker script provides a new symbol _fw_rw_offset that marks the
beginning of the RW section. It also ensures that the split is a power-of-2
as required by pmp.
 
This lays ground work for enforcing the permissions from M-mode.

Changes in v2:
* Added a check if fw_rw_offset is a power of w
* Added a check if fw_start and fw_rw_offset are aligned

Changes in v3:
* Use of local variable to latch the value in fw_rw_offset linker symbol
* Check that fw_rw_offset is non-zero before power-of-2 check

Himanshu Chauhan (5):
  firmware: Split RO/RX and RW sections
  firmware: Move dynsym and reladyn sections to RX section
  firmware: Add RW section offset in scratch
  lib: sbi: Print the RW section offset
  Add two entries:

 firmware/fw_base.S        |  8 ++++++++
 firmware/fw_base.ldS      | 43 ++++++++++++++++++++++++---------------
 include/sbi/sbi_scratch.h | 24 +++++++++++++---------
 lib/sbi/sbi_domain.c      | 24 ++++++++++++++++++++--
 lib/sbi/sbi_init.c        |  1 +
 5 files changed, 72 insertions(+), 28 deletions(-)

-- 
2.39.1