opensbi: Initial commit of OpenSBI

This is used as a bootloader for RISC-V QEMU machines.

(From OE-Core rev: 112ca2174dd97f5ca9ea25f83007d44054abc487)

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

4 files changed, 252 insertions, 0 deletions

diff --git a/meta/recipes-bsp/opensbi/files/0001-Makefile-Don-t-specify-mabi-or-march.patch b/meta/recipes-bsp/opensbi/files/0001-Makefile-Don-t-specify-mabi-or-march.patch
new file mode 100644
index 0000000000..9c2d0eb479
--- /dev/null
+++ b/meta/recipes-bsp/opensbi/files/0001-Makefile-Don-t-specify-mabi-or-march.patch
@@ -0,0 +1,38 @@
+From f5871e1f3650d6c8a032928cb5d8ca00c275c377 Mon Sep 17 00:00:00 2001
+From: Alistair Francis <alistair.francis@wdc.com>
+Date: Fri, 15 Feb 2019 14:57:41 -0800
+Subject: [PATCH] Makefile: Don't specify mabi or march
+
+To avoid
+    can't link double-float modules with soft-float modules
+errors when building 32-bit openSBI don't specify mabi or march.
+
+Upstream-Status: Inappropriate [Fixes a 32-bit Yocto flow bug]
+Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
+---
+ Makefile | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index ae68f55..10851fc 100644
+--- a/Makefile
++++ b/Makefile
+@@ -145,7 +145,6 @@ GENFLAGS    +=      $(firmware-genflags-y)
+ CFLAGS         =       -g -Wall -Werror -nostdlib -fno-strict-aliasing -O2
+ CFLAGS         +=      -fno-omit-frame-pointer -fno-optimize-sibling-calls
+ CFLAGS         +=      -mno-save-restore -mstrict-align
+-CFLAGS         +=      -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
+ CFLAGS         +=      -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
+ CFLAGS         +=      $(GENFLAGS)
+ CFLAGS         +=      $(platform-cflags-y)
+@@ -158,7 +157,6 @@ CPPFLAGS    +=      $(firmware-cppflags-y)
+ ASFLAGS                =       -g -Wall -nostdlib -D__ASSEMBLY__
+ ASFLAGS                +=      -fno-omit-frame-pointer -fno-optimize-sibling-calls
+ ASFLAGS                +=      -mno-save-restore -mstrict-align
+-ASFLAGS                +=      -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
+ ASFLAGS                +=      -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
+ ASFLAGS                +=      $(GENFLAGS)
+ ASFLAGS                +=      $(platform-asflags-y)
+-- 
+2.20.1
+
diff --git a/meta/recipes-bsp/opensbi/files/0002-lib-Create-a-sbi_ipi_data-structure.patch b/meta/recipes-bsp/opensbi/files/0002-lib-Create-a-sbi_ipi_data-structure.patch
new file mode 100644
index 0000000000..3c846bde62
--- /dev/null
+++ b/meta/recipes-bsp/opensbi/files/0002-lib-Create-a-sbi_ipi_data-structure.patch
@@ -0,0 +1,128 @@
+From 508a27204cbbca0a9430236e56681e5e0d343fb9 Mon Sep 17 00:00:00 2001
+From: Alistair Francis <alistair.francis@wdc.com>
+Date: Fri, 8 Mar 2019 11:22:22 -0800
+Subject: [PATCH] lib: Create a sbi_ipi_data structure
+
+Create a sbi_ipi_data structure that holds unpacked IPI information. At
+the same time remove ipi_type from the sbi_scratch struct and use a
+fixed offset to access it.
+
+This structure fits in behind the sbi_scratch structure.
+
+This fixes https://github.com/riscv/opensbi/issues/81
+
+Upstream-Status: Backport [https://github.com/riscv/opensbi/commit/508a27204cbbca0a9430236e56681e5e0d343fb9]
+Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
+---
+ firmware/fw_base.S        |  1 -
+ include/sbi/sbi_scratch.h | 23 ++++++++++++++++-------
+ lib/sbi_ipi.c             |  8 +++++---
+ 3 files changed, 21 insertions(+), 11 deletions(-)
+
+diff --git a/firmware/fw_base.S b/firmware/fw_base.S
+index cf2c6a0..69cfc90 100644
+--- a/firmware/fw_base.S
++++ b/firmware/fw_base.S
+@@ -183,7 +183,6 @@ _start_warm:
+        REG_S   a4, SBI_SCRATCH_PLATFORM_ADDR_OFFSET(tp)
+        la      a4, _hartid_to_scratch
+        REG_S   a4, SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET(tp)
+-       REG_S   zero, SBI_SCRATCH_IPI_TYPE_OFFSET(tp)
+        REG_S   zero, SBI_SCRATCH_TMP0_OFFSET(tp)
+ 
+        /* Setup stack */
+diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
+index 8389ef3..70ab384 100644
+--- a/include/sbi/sbi_scratch.h
++++ b/include/sbi/sbi_scratch.h
+@@ -28,17 +28,24 @@
+ #define SBI_SCRATCH_PLATFORM_ADDR_OFFSET       (6 * __SIZEOF_POINTER__)
+ /** Offset of hartid_to_scratch member in sbi_scratch */
+ #define SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET   (7 * __SIZEOF_POINTER__)
+-/** Offset of ipi_type member in sbi_scratch */
+-#define SBI_SCRATCH_IPI_TYPE_OFFSET            (8 * __SIZEOF_POINTER__)
+ /** Offset of tmp0 member in sbi_scratch */
+-#define SBI_SCRATCH_TMP0_OFFSET                        (9 * __SIZEOF_POINTER__)
+-/** Maximum size of sbi_scratch */
+-#define SBI_SCRATCH_SIZE                       256
++#define SBI_SCRATCH_TMP0_OFFSET                        (8 * __SIZEOF_POINTER__)
++
++/** sbi_ipi_data is located behind sbi_scratch. This struct is not packed. */
++/** Offset of ipi_type in sbi_ipi_data */
++#define SBI_IPI_DATA_IPI_TYPE_OFFSET           (15 * __SIZEOF_POINTER__)
++
++/** Maximum size of sbi_scratch and sbi_ipi_data */
++#define SBI_SCRATCH_SIZE                       (32 * __SIZEOF_POINTER__)
+ 
+ #ifndef __ASSEMBLY__
+ 
+ #include <sbi/sbi_types.h>
+ 
++struct sbi_ipi_data {
++       unsigned long ipi_type;
++};
++
+ /** Representation of per-HART scratch space */
+ struct sbi_scratch {
+        /** Start (or base) address of firmware linked to OpenSBI library */
+@@ -57,8 +64,6 @@ struct sbi_scratch {
+        unsigned long platform_addr;
+        /** Address of HART ID to sbi_scratch conversion function */
+        unsigned long hartid_to_scratch;
+-       /** IPI type (or flags) */
+-       unsigned long ipi_type;
+        /** Temporary storage */
+        unsigned long tmp0;
+ } __packed;
+@@ -71,6 +76,10 @@ struct sbi_scratch {
+ #define sbi_scratch_thishart_arg1_ptr()        \
+ ((void *)(sbi_scratch_thishart_ptr()->next_arg1))
+ 
++/** Get pointer to sbi_ipi_data from sbi_scratch */
++#define sbi_ipi_data_ptr(scratch)      \
++((struct sbi_ipi_data *)(void*)scratch + SBI_IPI_DATA_IPI_TYPE_OFFSET)
++
+ #endif
+ 
+ #endif
+diff --git a/lib/sbi_ipi.c b/lib/sbi_ipi.c
+index 0e371d7..e0f2a19 100644
+--- a/lib/sbi_ipi.c
++++ b/lib/sbi_ipi.c
+@@ -31,7 +31,7 @@ static int sbi_ipi_send(struct sbi_scratch *scratch, u32 hartid, u32 event)
+         * trigger the interrupt
+         */
+        remote_scratch = sbi_hart_id_to_scratch(scratch, hartid);
+-       atomic_raw_set_bit(event, &remote_scratch->ipi_type);
++       atomic_raw_set_bit(event, &sbi_ipi_data_ptr(remote_scratch)->ipi_type);
+        mb();
+        sbi_platform_ipi_send(plat, hartid);
+        if (event != SBI_IPI_EVENT_SOFT)
+@@ -80,7 +80,7 @@ void sbi_ipi_process(struct sbi_scratch *scratch)
+        sbi_platform_ipi_clear(plat, hartid);
+ 
+        do {
+-               ipi_type = scratch->ipi_type;
++               ipi_type = sbi_ipi_data_ptr(scratch)->ipi_type;
+                rmb();
+                ipi_event = __ffs(ipi_type);
+                switch (ipi_event) {
+@@ -97,12 +97,14 @@ void sbi_ipi_process(struct sbi_scratch *scratch)
+                        sbi_hart_hang();
+                        break;
+                };
+-               ipi_type = atomic_raw_clear_bit(ipi_event, &scratch->ipi_type);
++               ipi_type = atomic_raw_clear_bit(ipi_event, &sbi_ipi_data_ptr(scratch)->ipi_type);
+        } while(ipi_type > 0);
+ }
+ 
+ int sbi_ipi_init(struct sbi_scratch *scratch, bool cold_boot)
+ {
++       sbi_ipi_data_ptr(scratch)->ipi_type = 0x00;
++
+        /* Enable software interrupts */
+        csr_set(CSR_MIE, MIP_MSIP);
+ 
+-- 
+2.22.0
+
diff --git a/meta/recipes-bsp/opensbi/opensbi-payloads.inc b/meta/recipes-bsp/opensbi/opensbi-payloads.inc
new file mode 100644
index 0000000000..7df168325a
--- /dev/null
+++ b/meta/recipes-bsp/opensbi/opensbi-payloads.inc
@@ -0,0 +1,37 @@
+def riscv_get_extra_oemake_image(d):
+    sbi_payload = d.getVar('RISCV_SBI_PAYLOAD')
+    deploy_dir = d.getVar('DEPLOY_DIR_IMAGE')
+
+    if sbi_payload is None:
+        return ""
+
+    if d.getVar('RISCV_SBI_PAYLOAD'):
+        return "FW_PAYLOAD_PATH=" + deploy_dir + "/" + sbi_payload
+
+    return ""
+
+def riscv_get_extra_oemake_fdt(d):
+    sbi_fdt_payload = d.getVar('RISCV_SBI_FDT')
+    deploy_dir = d.getVar('DEPLOY_DIR_IMAGE')
+
+    if sbi_fdt_payload is None:
+        return ""
+
+    if d.getVar('RISCV_SBI_PAYLOAD'):
+        # This is internal to openSBI, not a full path
+        return "FW_PAYLOAD_FDT=" + sbi_fdt_payload
+
+    return ""
+
+def riscv_get_do_compile_depends(d):
+    sbi_payload = d.getVar('RISCV_SBI_PAYLOAD')
+
+    if sbi_payload is None:
+        return ""
+
+    if 'linux' in sbi_payload or 'Image' in sbi_payload:
+        return "virtual/kernel:do_deploy"
+    if 'u-boot' in sbi_payload:
+        return "virtual/bootloader:do_deploy"
+
+    return ""
diff --git a/meta/recipes-bsp/opensbi/opensbi_0.3.bb b/meta/recipes-bsp/opensbi/opensbi_0.3.bb
new file mode 100644
index 0000000000..2b4fb97df2
--- /dev/null
+++ b/meta/recipes-bsp/opensbi/opensbi_0.3.bb
@@ -0,0 +1,49 @@
+SUMMARY = "RISC-V Open Source Supervisor Binary Interface (OpenSBI)"
+DESCRIPTION = "OpenSBI aims to provide an open-source and extensible implementation of the RISC-V SBI specification for a platform specific firmware (M-mode) and a general purpose OS, hypervisor or bootloader (S-mode or HS-mode). OpenSBI implementation can be easily extended by RISC-V platform or System-on-Chip vendors to fit a particular hadware configuration."
+LICENSE = "BSD-2-Clause"
+LIC_FILES_CHKSUM = "file://COPYING.BSD;md5=c36118b4f615f9da37635f2a7ac8ccaf"
+DEPENDS += "dtc-native"
+
+require opensbi-payloads.inc
+
+inherit autotools-brokensep
+
+SRCREV = "ca20ac0cd4c099006d4eea4d9ac7bd7b58e2ae0f"
+SRC_URI = "git://github.com/riscv/opensbi.git \
+           file://0001-Makefile-Don-t-specify-mabi-or-march.patch \
+           file://0002-lib-Create-a-sbi_ipi_data-structure.patch \
+          "
+
+S = "${WORKDIR}/git"
+
+SRC_URI[md5sum] = "621f38d8205ef5fb185e4055025e73df"
+SRC_URI[sha256sum] = "07f18b73abf3b85aabe5bead19a923716c100d30eb58033459f39c3a224be300"
+
+EXTRA_OEMAKE += "PLATFORM=${RISCV_SBI_PLAT} I=${D}"
+# If RISCV_SBI_PAYLOAD is set then include it as a payload
+EXTRA_OEMAKE_append = " ${@riscv_get_extra_oemake_image(d)} ${@riscv_get_extra_oemake_fdt(d)}"
+
+# Required if specifying a custom payload
+do_compile[depends] += "${@riscv_get_do_compile_depends(d)}"
+
+do_install_append() {
+        # In the future these might be required as a dependency for other packages.
+        # At the moment just delete them to avoid warnings
+        rm -r ${D}/include
+        rm -r ${D}/platform/${RISCV_SBI_PLAT}/lib
+        rm -r ${D}/platform/${RISCV_SBI_PLAT}/firmware/payloads
+}
+
+do_deploy () {
+        install -d ${DEPLOY_DIR_IMAGE}
+        install -m 755 ${D}/platform/${RISCV_SBI_PLAT}/firmware/fw_payload.* ${DEPLOY_DIR_IMAGE}/
+        install -m 755 ${D}/platform/${RISCV_SBI_PLAT}/firmware/fw_jump.* ${DEPLOY_DIR_IMAGE}/
+}
+
+addtask deploy after do_install
+
+FILES_${PN} += "/platform/${RISCV_SBI_PLAT}/firmware/fw_jump.*"
+FILES_${PN} += "/platform/${RISCV_SBI_PLAT}/firmware/fw_payload.*"
+
+COMPATIBLE_HOST = "(riscv64|riscv32).*"
+INHIBIT_PACKAGE_STRIP = "1"