[Minios-devel] [UNIKRAFT PATCHv4 21/43] plat/kvm: Add Arm64 basic entry code

[Wei Chen <Wei.Chen@xxxxxxx>]

QEMU/KVM can boot an Arm64 elf image without multiboot. In this case,
we can plage _libkvmplat_entry to entry64.S directly as the vCPU
reset entry. In this basic entry code, we just initialize the boot
stack and prepare jumping to _libkvmplat_start.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
---
 plat/kvm/arm/entry64.S | 36 ++++++++++++++++++++++++++++++
 plat/kvm/arm/setup.c   | 50 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 plat/kvm/arm/entry64.S
 create mode 100644 plat/kvm/arm/setup.c

diff --git a/plat/kvm/arm/entry64.S b/plat/kvm/arm/entry64.S
new file mode 100644
index 0000000..8a8a2e0
--- /dev/null
+++ b/plat/kvm/arm/entry64.S
@@ -0,0 +1,36 @@
+#include <uk/arch/limits.h>
+#include <arm/cpu_defs.h>
+
+.data
+.globl _dtb
+
+#define BOOT_STACK_SIZE PAGE_SIZE
+
+/*
+ * The registers used by _libkvmplat_start:
+ * x0 - FDT pointer
+ */
+
+.text
+ENTRY(_libkvmplat_entry)
+       /* Boot stack is placed after pagetable area temporarily */
+       ldr x26, =_end
+       add x26, x26, #PAGE_TABLE_SIZE
+       add x27, x26, #BOOT_STACK_SIZE
+
+       /* Clean the boot stack */
+1:
+       stp xzr, xzr, [x26], #16
+       stp xzr, xzr, [x26], #16
+       stp xzr, xzr, [x26], #16
+       stp xzr, xzr, [x26], #16
+       cmp x26, x27
+       b.lo 1b
+
+       mov sp, x27
+
+
+       /* Load dtb address to x0 as a parameter */
+       ldr x0, =_dtb
+       b _libkvmplat_start
+END(_libkvmplat_entry)
diff --git a/plat/kvm/arm/setup.c b/plat/kvm/arm/setup.c
new file mode 100644
index 0000000..a5581b7
--- /dev/null
+++ b/plat/kvm/arm/setup.c
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: ISC */
+/*
+ * Authors: Dan Williams
+ *               Martin Lucina
+ *               Ricardo Koller
+ *               Felipe Huici <felipe.huici@xxxxxxxxx>
+ *               Florian Schmidt <florian.schmidt@xxxxxxxxx>
+ *               Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
+ *               Wei Chen <Wei.Chen@xxxxxxx>
+ *
+ * Copyright (c) 2015-2017 IBM
+ * Copyright (c) 2016-2017 Docker, Inc.
+ * Copyright (c) 2017 NEC Europe Ltd., NEC Corporation
+ * Copyright (c) 2018 Arm Ltd.
+ *
+ * Permission to use, copy, modify, and/or distribute this software
+ * for any purpose with or without fee is hereby granted, provided
+ * that the above copyright notice and this permission notice appear
+ * in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+#include <libfdt.h>
+#include <kvm/console.h>
+#include <uk/arch/limits.h>
+#include <uk/plat/console.h>
+#include <uk/assert.h>
+#include <uk/essentials.h>
+
+static void _init_cpufeatures(void)
+{
+       /* TODO */
+}
+
+void _libkvmplat_start(void *dtb_pointer)
+{
+       _init_cpufeatures();
+       _libkvmplat_init_console();
+
+       uk_printd(DLVL_INFO, "Entering from KVM (arm64)...\n");
+}
-- 
2.17.1


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