new file mode 100644
@@ -0,0 +1,60 @@
+* Xen hypervisor device tree bindings
+
+Xen ARM virtual platforms shall have a top-level "hypervisor" node with
+the following properties:
+
+- compatible:
+ compatible = "xen,xen-<version>", "xen,xen";
+ where <version> is the version of the Xen ABI of the platform.
+
+- reg: specifies the base physical address and size of a region in
+ memory where the grant table should be mapped to, using an
+ HYPERVISOR_memory_op hypercall. The memory region is large enough to map
+ the whole grant table (it is larger or equal to gnttab_max_grant_frames()).
+ This property is unnecessary when booting Dom0 using ACPI.
+
+- interrupts: the interrupt used by Xen to inject event notifications.
+ A GIC node is also required.
+ This property is unnecessary when booting Dom0 using ACPI.
+
+To support UEFI on Xen ARM virtual platforms, Xen populates the FDT "uefi" node
+under /hypervisor with following parameters:
+
+________________________________________________________________________________
+Name | Size | Description
+================================================================================
+xen,uefi-system-table | 64-bit | Guest physical address of the UEFI System
+ | | Table.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-start | 64-bit | Guest physical address of the UEFI memory
+ | | map.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-size | 32-bit | Size in bytes of the UEFI memory map
+ | | pointed to in previous entry.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-desc-size | 32-bit | Size in bytes of each entry in the UEFI
+ | | memory map.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-desc-ver | 32-bit | Version of the mmap descriptor format.
+--------------------------------------------------------------------------------
+
+Example (assuming #address-cells = <2> and #size-cells = <2>):
+
+hypervisor {
+ compatible = "xen,xen-4.3", "xen,xen";
+ reg = <0 0xb0000000 0 0x20000>;
+ interrupts = <1 15 0xf08>;
+ uefi {
+ xen,uefi-system-table = <0xXXXXXXXX>;
+ xen,uefi-mmap-start = <0xXXXXXXXX>;
+ xen,uefi-mmap-size = <0xXXXXXXXX>;
+ xen,uefi-mmap-desc-size = <0xXXXXXXXX>;
+ xen,uefi-mmap-desc-ver = <0xXXXXXXXX>;
+ };
+};
+
+The format and meaning of the "xen,uefi-*" parameters are similar to those in
+Documentation/arm/uefi.txt in Linux, which are provided by the regular Linux
+UEFI stub. However they differ because they are provided by the Xen hypervisor,
+together with a set of UEFI runtime services implemented via hypercalls, see
+xen/include/public/platform.h.
@@ -1357,6 +1357,144 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
}
#ifdef CONFIG_ACPI
+#define ACPI_DOM0_FDT_MIN_SIZE 4096
+
+static int acpi_make_chosen_node(const struct kernel_info *kinfo)
+{
+ int res;
+ const char *bootargs = NULL;
+ const struct bootmodule *mod = kinfo->kernel_bootmodule;
+ void *fdt = kinfo->fdt;
+
+ DPRINT("Create chosen node\n");
+ res = fdt_begin_node(fdt, "chosen");
+ if ( res )
+ return res;
+
+ if ( mod && mod->cmdline[0] )
+ {
+ bootargs = &mod->cmdline[0];
+ res = fdt_property(fdt, "bootargs", bootargs, strlen(bootargs) + 1);
+ if ( res )
+ return res;
+ }
+
+ /*
+ * If the bootloader provides an initrd, we must create a placeholder
+ * for the initrd properties. The values will be replaced later.
+ */
+ if ( mod && mod->size )
+ {
+ u64 a = 0;
+ res = fdt_property(kinfo->fdt, "linux,initrd-start", &a, sizeof(a));
+ if ( res )
+ return res;
+
+ res = fdt_property(kinfo->fdt, "linux,initrd-end", &a, sizeof(a));
+ if ( res )
+ return res;
+ }
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
+static int acpi_make_hypervisor_node(const struct kernel_info *kinfo,
+ struct membank tbl_add[])
+{
+ const char compat[] =
+ "xen,xen-"__stringify(XEN_VERSION)"."__stringify(XEN_SUBVERSION)"\0"
+ "xen,xen";
+ int res;
+ /* Convenience alias */
+ void *fdt = kinfo->fdt;
+
+ DPRINT("Create hypervisor node\n");
+
+ /* See linux Documentation/devicetree/bindings/arm/xen.txt */
+ res = fdt_begin_node(fdt, "hypervisor");
+ if ( res )
+ return res;
+
+ /* Cannot use fdt_property_string due to embedded nulls */
+ res = fdt_property(fdt, "compatible", compat, sizeof(compat));
+ if ( res )
+ return res;
+
+ res = acpi_make_efi_nodes(fdt, tbl_add);
+ if ( res )
+ return res;
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
+/*
+ * Prepare a minimal DTB for Dom0 which contains bootargs, initrd, memory
+ * information, EFI table.
+ */
+static int create_acpi_dtb(struct kernel_info *kinfo, struct membank tbl_add[])
+{
+ int new_size;
+ int ret;
+
+ DPRINT("Prepare a min DTB for DOM0\n");
+
+ /* Allocate min size for DT */
+ new_size = ACPI_DOM0_FDT_MIN_SIZE;
+ kinfo->fdt = xmalloc_bytes(new_size);
+
+ if ( kinfo->fdt == NULL )
+ return -ENOMEM;
+
+ /* Create a new empty DT for DOM0 */
+ ret = fdt_create(kinfo->fdt, new_size);
+ if ( ret < 0 )
+ goto err;
+
+ ret = fdt_finish_reservemap(kinfo->fdt);
+ if ( ret < 0 )
+ goto err;
+
+ ret = fdt_begin_node(kinfo->fdt, "/");
+ if ( ret < 0 )
+ goto err;
+
+ ret = fdt_property_cell(kinfo->fdt, "#address-cells", 2);
+ if ( ret )
+ return ret;
+
+ ret = fdt_property_cell(kinfo->fdt, "#size-cells", 1);
+ if ( ret )
+ return ret;
+
+ /* Create a chosen node for DOM0 */
+ ret = acpi_make_chosen_node(kinfo);
+ if ( ret )
+ goto err;
+
+ ret = acpi_make_hypervisor_node(kinfo, tbl_add);
+ if ( ret )
+ goto err;
+
+ ret = fdt_end_node(kinfo->fdt);
+ if ( ret < 0 )
+ goto err;
+
+ ret = fdt_finish(kinfo->fdt);
+ if ( ret < 0 )
+ goto err;
+
+ return 0;
+
+ err:
+ printk("Device tree generation failed (%d).\n", ret);
+ xfree(kinfo->fdt);
+ return -EINVAL;
+}
+
static void acpi_map_other_tables(struct domain *d)
{
int i;
@@ -1745,6 +1883,10 @@ static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
clean_and_invalidate_dcache_va_range(d->arch.efi_acpi_table,
d->arch.efi_acpi_len);
+ rc = create_acpi_dtb(kinfo, tbl_add);
+ if ( rc != 0 )
+ return rc;
+
return 0;
}
#else
@@ -25,6 +25,7 @@
#include "efi-dom0.h"
#include <xen/sched.h>
#include <xen/pfn.h>
+#include <xen/libfdt/libfdt.h>
#include <asm/setup.h>
#include <asm/acpi.h>
#include "../../../common/decompress.h"
@@ -138,6 +139,44 @@ void __init acpi_create_efi_mmap_table(struct domain *d,
* (mem->nr_banks + acpi_mem.nr_banks + 1);
}
+/* Create /hypervisor/uefi node for efi properties. */
+int __init acpi_make_efi_nodes(void *fdt, struct membank tbl_add[])
+{
+ int res;
+
+ res = fdt_begin_node(fdt, "uefi");
+ if ( res )
+ return res;
+
+ res = fdt_property_u64(fdt, "xen,uefi-system-table",
+ tbl_add[TBL_EFIT].start);
+ if ( res )
+ return res;
+
+ res = fdt_property_u64(fdt, "xen,uefi-mmap-start",
+ tbl_add[TBL_MMAP].start);
+ if ( res )
+ return res;
+
+ res = fdt_property_u32(fdt, "xen,uefi-mmap-size",
+ tbl_add[TBL_MMAP].size);
+ if ( res )
+ return res;
+
+ res = fdt_property_u32(fdt, "xen,uefi-mmap-desc-size",
+ sizeof(EFI_MEMORY_DESCRIPTOR));
+ if ( res )
+ return res;
+
+ res = fdt_property_u32(fdt, "xen,uefi-mmap-desc-ver", 1);
+ if ( res )
+ return res;
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
/*
* Local variables:
* mode: C
@@ -60,6 +60,8 @@ void acpi_create_efi_mmap_table(struct domain *d,
const struct meminfo *mem,
struct membank tbl_add[]);
+int acpi_make_efi_nodes(void *fdt, struct membank tbl_add[]);
+
int construct_dom0(struct domain *d);
void discard_initial_modules(void);