PLIC DT entry fixup can be done by comparing external
interrupt number instead of context id. No need to invoke
fixup for each plic context.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Perform following DT updates.
1. Mask hart if mmu is not supported.
2. Add stdout-path under chosen node.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Signed-off-by: Atish Patra <atish.patra@wdc.com>

There are couple of string function defined in platform
code. We no longer need them as we can directly link minimal
libc.

Every platform required to inclde this as PLIC driver required
libc functions.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Libfdt already have fdt.c and fdt.h.
Rename both fdt.* present in openSBI to tinyfdt.*

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Some of the platform (i.e. SiFive FU540) requires Device
Tree modification before it is passed to higher stages.
Add libfdt support now to help this process. Libfdt should
only be included per platform basis.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

libfdt requires minimal libc support. Absoultely
minimum functions are added in libc.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

This patch adds doxygen style documentation for struct sbi_trap_regs
and related macros/defines/functions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch adds __packed define for specifying packed
attribute of structures.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch adds doxygen style documentation for struct sbi_scratch
and related helper macros/defines.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch adds doxygen style documentation for sbi_init() API.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

There are quite a few noreturn functions in OpenSBI hence
we add commong __noreturn define for noreturn functin attribute.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The patch updates title in contributing.md to match
other .md files under docs/ directory.

Signed-off-by: Anup Patel <anup.pate@wdc.com>

This patch updates top-level README.md for steps required to build
and install documentation PDF.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch extends top-level makefile to build and install
documentation. The 'docs' make target is for building the
documentation PDF whereas 'install_docs' make target is for
installing the documentation PDF.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The '?=' will not assign value if the target make variable is
overriden via command-line or is set in environment variable.
On other hand, '=' will not assign value only if variable is
overriden via command-line parameter.

It is quite common to have CC, AS, CPP, LD, etc to be set as
environment variables pointing to native compiler and binutils.
If '-rR' option is not set in MAKEFLAGS then this results in
compile error because '?=' will use the native compiler and
binutils. If '-rR' option is set in MAKEFLAGS then this again
results in compile error because CC, AS, CPP, etc are set to
empty strings which causes '?=' to use empty string as compiler
and binutils.

To handle this, we use '?=' only when CROSS_COMPILE is not
defined and we use '=' when CROSS_COMPILE is defined.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

To avoid this message (and subsequent errors):
    warning: linker input file unused because linking not done
force GCC to treat the linker script preprocessing as a C file.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Convert the Makefile to a more standard format and don't forcefully
overwrite a users enviroment.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Instead of using a confusing and custom option, allow verbose Makefile
with the standard V=1.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

This patch extends misaligned load/store trap handling to
handle FP regs as well.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch adds hardware floating-point (hard FP) access
macros and defines.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Various fixes

Simplify sysctl.c code to only the used CPU freqency function.
This reduces the size of the final firmware by 4KB.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

k210_console_putc() and k210_console_init() are local functions. Declare
them as static.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

Instead of printing the generic "<build_directory>" and
"<install_directory>" strings, print the actual paths for the build
and install directories during "make clean" and "make distclean".

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

The tmp0 member was added in struct sbi_scratch to assist
register save/restore at time of trap handling. This tmp0
is not unsed any more hence removing it.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The struct sbi_trap_regs related defines RISCV_TRAP_REGS_xyz should
be in sbi_trap.h so that we can keep these defines in-sync with changes
in struct sbi_trap_regs.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The struct sbi_platform related defines RISCV_PLATFORM_xyz should
be in sbi_platform.h so that we can keep these defines in-sync
with changes in struct sbi_platform.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The struct sbi_scratch related defines RISCV_SCRATCH_xyz should
be in sbi_scratch.h so that we can keep these defines in-sync
with changes in struct sbi_scratch.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

We replace #csr with __ASM_STR(csr) in all csr_xyz() macros
so that we can pass CSR number instead of CSR name when GCC
is not aware of CSR name.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The patch removes redundant csr_read_n() and csr_write_n()
because same thing can be achieved by using __ASM_STR()
macro in csr_read() and csr_write() macros.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch adds documentation for qemu/virt and
qemu/sifive_u platform supports.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch does minor typo fixes in top-level README.md.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Currently, we fail with error SBI_ENOTSUPP when we are not able
to handle illegal instruction trap. Instead, we should just
redirect illegal instruction trap to S-mode when not handled.

This redirection of illegal instruction trap will help lazy
save/restore of floating point registers to work correctly in
Linux kernel.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The Kendryte K210 platform support was contributed by Damien
hence fix author name.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

We rename sifive/hifive_u540 platform support to sifive/fu540
to match the SoC name which is SiFive FU540 (as-per user manual).

In fact, we can expect no (or very minimal) board specific
quirks in sifive/fu540 platform support. These board specific
quirks can be turned on/off in-future using PLATFORM_<xyz>
make command-line option.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>