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[xen master] xen/riscv: Initial RISC-V support to build/run minimal Xen



commit bb62c25e3e5c3ff0c61a0351b7c4c65ff11ce9d9
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Thu Jan 5 14:01:45 2023 +0200
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Jan 5 16:35:55 2023 +0000

    xen/riscv: Initial RISC-V support to build/run minimal Xen
    
    The patch provides a minimal amount of changes to start
    build and run minimal Xen binary at GitLab CI&CD that will
    allow continuous checking of the build status of RISC-V Xen.
    
    Except introduction of new files the following changes were done:
    * Redefinition of ALIGN define from '.align 2' to '.align 4', as 2 was
      incorrect choice done previously.
    * ALL_OBJ-y and ALL_LIBS-y were temporary overwritted to produce
      a minimal hypervisor image otherwise it will be required to push
      huge amount of headers and stubs for common, drivers, libs etc which
      aren't necessary for now.
    * Section changed from .text to .text.header for start function
      to make it the first one executed.
    * Rework riscv64/Makefile logic to rebase over changes since the first
      RISC-V commit.
    
    RISC-V Xen can be built by the following instructions:
      $ CONTAINER=riscv64 ./automation/scripts/containerize \
           make XEN_TARGET_ARCH=riscv64 -C xen tiny64_defconfig
      $ CONTAINER=riscv64 ./automation/scripts/containerize \
           make XEN_TARGET_ARCH=riscv64 -C xen build
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/riscv/Makefile             |  14 ++++
 xen/arch/riscv/arch.mk              |   4 +
 xen/arch/riscv/include/asm/config.h |   9 +-
 xen/arch/riscv/riscv64/Makefile     |   2 +-
 xen/arch/riscv/riscv64/head.S       |   4 +-
 xen/arch/riscv/xen.lds.S            | 158 ++++++++++++++++++++++++++++++++++++
 6 files changed, 186 insertions(+), 5 deletions(-)

diff --git a/xen/arch/riscv/Makefile b/xen/arch/riscv/Makefile
index 942e4ffbc1..248f2cbb3e 100644
--- a/xen/arch/riscv/Makefile
+++ b/xen/arch/riscv/Makefile
@@ -1,2 +1,16 @@
+obj-$(CONFIG_RISCV_64) += riscv64/
+
+$(TARGET): $(TARGET)-syms
+       $(OBJCOPY) -O binary -S $< $@
+
+$(TARGET)-syms: $(objtree)/prelink.o $(obj)/xen.lds
+       $(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds -N $< $(build_id_linker) -o $@
+       $(NM) -pa --format=sysv $(@D)/$(@F) \
+               | $(objtree)/tools/symbols --all-symbols --xensyms --sysv 
--sort \
+               >$(@D)/$(@F).map
+
+$(obj)/xen.lds: $(src)/xen.lds.S FORCE
+       $(call if_changed_dep,cpp_lds_S)
+
 .PHONY: include
 include:
diff --git a/xen/arch/riscv/arch.mk b/xen/arch/riscv/arch.mk
index ae8fe9dec7..012dc677c3 100644
--- a/xen/arch/riscv/arch.mk
+++ b/xen/arch/riscv/arch.mk
@@ -11,3 +11,7 @@ riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
 # -mcmodel=medlow would force Xen into the lower half.
 
 CFLAGS += -march=$(riscv-march-y) -mstrict-align -mcmodel=medany
+
+# TODO: Drop override when more of the build is working
+override ALL_OBJS-y = arch/$(TARGET_ARCH)/built_in.o
+override ALL_LIBS-y =
diff --git a/xen/arch/riscv/include/asm/config.h 
b/xen/arch/riscv/include/asm/config.h
index e2ae21de61..0370f865f3 100644
--- a/xen/arch/riscv/include/asm/config.h
+++ b/xen/arch/riscv/include/asm/config.h
@@ -1,6 +1,9 @@
 #ifndef __RISCV_CONFIG_H__
 #define __RISCV_CONFIG_H__
 
+#include <xen/const.h>
+#include <xen/page-size.h>
+
 #if defined(CONFIG_RISCV_64)
 # define LONG_BYTEORDER 3
 # define ELFSIZE 64
@@ -28,7 +31,7 @@
 
 /* Linkage for RISCV */
 #ifdef __ASSEMBLY__
-#define ALIGN .align 2
+#define ALIGN .align 4
 
 #define ENTRY(name)                                \
   .globl name;                                     \
@@ -36,6 +39,10 @@
   name:
 #endif
 
+#define XEN_VIRT_START  _AT(UL, 0x80200000)
+
+#define SMP_CACHE_BYTES (1 << 6)
+
 #endif /* __RISCV_CONFIG_H__ */
 /*
  * Local variables:
diff --git a/xen/arch/riscv/riscv64/Makefile b/xen/arch/riscv/riscv64/Makefile
index 15a4a65f66..3340058c08 100644
--- a/xen/arch/riscv/riscv64/Makefile
+++ b/xen/arch/riscv/riscv64/Makefile
@@ -1 +1 @@
-extra-y += head.o
+obj-y += head.o
diff --git a/xen/arch/riscv/riscv64/head.S b/xen/arch/riscv/riscv64/head.S
index 0dbc27ba75..990edb70a0 100644
--- a/xen/arch/riscv/riscv64/head.S
+++ b/xen/arch/riscv/riscv64/head.S
@@ -1,6 +1,4 @@
-#include <asm/config.h>
-
-        .text
+        .section .text.header, "ax", %progbits
 
 ENTRY(start)
         j  start
diff --git a/xen/arch/riscv/xen.lds.S b/xen/arch/riscv/xen.lds.S
new file mode 100644
index 0000000000..ca57cce75c
--- /dev/null
+++ b/xen/arch/riscv/xen.lds.S
@@ -0,0 +1,158 @@
+#include <xen/xen.lds.h>
+
+#undef ENTRY
+#undef ALIGN
+
+OUTPUT_ARCH(riscv)
+ENTRY(start)
+
+PHDRS
+{
+    text PT_LOAD ;
+#if defined(BUILD_ID)
+    note PT_NOTE ;
+#endif
+}
+
+SECTIONS
+{
+    . = XEN_VIRT_START;
+    _start = .;
+    .text : {
+        _stext = .;            /* Text section */
+        *(.text.header)
+
+        *(.text.cold)
+        *(.text.unlikely .text.*_unlikely .text.unlikely.*)
+
+        *(.text)
+#ifdef CONFIG_CC_SPLIT_SECTIONS
+        *(.text.*)
+#endif
+
+        *(.fixup)
+        *(.gnu.warning)
+        . = ALIGN(POINTER_ALIGN);
+        _etext = .;             /* End of text section */
+    } :text
+
+    . = ALIGN(PAGE_SIZE);
+    .rodata : {
+        _srodata = .;          /* Read-only data */
+        *(.rodata)
+        *(.rodata.*)
+        *(.data.rel.ro)
+        *(.data.rel.ro.*)
+
+        VPCI_ARRAY
+
+        . = ALIGN(POINTER_ALIGN);
+        _erodata = .;        /* End of read-only data */
+    } :text
+
+    #if defined(BUILD_ID)
+    . = ALIGN(4);
+    .note.gnu.build-id : {
+        __note_gnu_build_id_start = .;
+        *(.note.gnu.build-id)
+        __note_gnu_build_id_end = .;
+    } :note :text
+    #endif
+    _erodata = .;                /* End of read-only data */
+
+    . = ALIGN(PAGE_SIZE);
+    .data.ro_after_init : {
+        __ro_after_init_start = .;
+        *(.data.ro_after_init)
+        . = ALIGN(PAGE_SIZE);
+        __ro_after_init_end = .;
+    } : text
+
+    .data.read_mostly : {
+        *(.data.read_mostly)
+    } :text
+
+    . = ALIGN(PAGE_SIZE);
+    .data : {                    /* Data */
+        *(.data.page_aligned)
+        . = ALIGN(8);
+        __start_schedulers_array = .;
+        *(.data.schedulers)
+        __end_schedulers_array = .;
+
+        HYPFS_PARAM
+
+        *(.data .data.*)
+        CONSTRUCTORS
+    } :text
+
+    . = ALIGN(PAGE_SIZE);             /* Init code and data */
+    __init_begin = .;
+    .init.text : {
+        _sinittext = .;
+        *(.init.text)
+        _einittext = .;
+        . = ALIGN(PAGE_SIZE);        /* Avoid mapping alt insns executable */
+    } :text
+    . = ALIGN(PAGE_SIZE);
+    .init.data : {
+        *(.init.rodata)
+        *(.init.rodata.*)
+
+        . = ALIGN(POINTER_ALIGN);
+        __setup_start = .;
+        *(.init.setup)
+        __setup_end = .;
+
+        __initcall_start = .;
+        *(.initcallpresmp.init)
+        __presmp_initcall_end = .;
+        *(.initcall1.init)
+        __initcall_end = .;
+
+        LOCK_PROFILE_DATA
+
+        *(.init.data)
+        *(.init.data.rel)
+        *(.init.data.rel.*)
+
+        . = ALIGN(8);
+        __ctors_start = .;
+        *(.ctors)
+        *(.init_array)
+        *(SORT(.init_array.*))
+        __ctors_end = .;
+    } :text
+    . = ALIGN(POINTER_ALIGN);
+    __init_end = .;
+
+    .bss : {                     /* BSS */
+        __bss_start = .;
+        *(.bss.stack_aligned)
+        . = ALIGN(PAGE_SIZE);
+        *(.bss.page_aligned)
+        . = ALIGN(PAGE_SIZE);
+        __per_cpu_start = .;
+        *(.bss.percpu.page_aligned)
+        *(.bss.percpu)
+        . = ALIGN(SMP_CACHE_BYTES);
+        *(.bss.percpu.read_mostly)
+        . = ALIGN(SMP_CACHE_BYTES);
+        __per_cpu_data_end = .;
+        *(.bss .bss.*)
+        . = ALIGN(POINTER_ALIGN);
+        __bss_end = .;
+    } :text
+    _end = . ;
+
+    /* Section for the device tree blob (if any). */
+    .dtb : { *(.dtb) } :text
+
+    DWARF2_DEBUG_SECTIONS
+
+    DISCARD_SECTIONS
+
+    STABS_DEBUG_SECTIONS
+
+    ELF_DETAILS_SECTIONS
+}
--
generated by git-patchbot for /home/xen/git/xen.git#master



 


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