xen/arm: Allow Xen to run on multiple platform without recompilation

Xen can include various platform support (ie: exynos5, versatile express...)
and choose during boot time a set of callbacks for the current board.
These callbacks will be called in places where each board can have specific
code. For the moment the callbacks are:
    - platform_init: additional initialization for the platform
    - platform_init_time: some platform (ie: Exynos 5) needs to initialize
    the timer with an uncommon way
    - platform_specific_mapping: add mapping to dom0 which are not specified
    in the device tree
    - platform_reset: reset the platform
    - platform_poweroff: poweroff the platform
    - platform_quirks: list of quirks for a specific board.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/xen/include/asm-arm/platform.h b/xen/include/asm-arm/platform.h
new file mode 100644
index 0000000000..e116265b24
--- /dev/null
+++ b/xen/include/asm-arm/platform.h
@@ -0,0 +1,55 @@
+#ifndef __ASM_ARM_PLATFORM_H
+#define __ASM_ARM_PLATFORM_H
+
+#include <xen/init.h>
+#include <xen/sched.h>
+#include <xen/mm.h>
+
+/* Describe specific operation for a board */
+struct platform_desc {
+    /* Platform name */
+    const char *name;
+    /* Array of device tree 'compatible' strings */
+    const char *const *compatible;
+    /* Platform initialization */
+    int (*init)(void);
+    int (*init_time)(void);
+    /* Specific mapping for dom0 */
+    int (*specific_mapping)(struct domain *d);
+    /* Platform reset */
+    void (*reset)(void);
+    /* Platform power-off */
+    void (*poweroff)(void);
+    /*
+     * Platform quirks
+     * Defined has a function because a platform can support multiple
+     * board with different quirk on each
+     */
+    uint32_t (*quirks)(void);
+};
+
+int __init platform_init(void);
+int __init platform_init_time(void);
+int __init platform_specific_mapping(struct domain *d);
+void platform_reset(void);
+void platform_poweroff(void);
+bool_t platform_has_quirk(uint32_t quirk);
+
+#define PLATFORM_START(_name, _namestr)                         \
+static const struct platform_desc  __plat_desc_##_name __used   \
+__attribute__((__section__(".arch.info"))) = {                  \
+    .name = _namestr,
+
+#define PLATFORM_END                                            \
+};
+
+#endif /* __ASM_ARM_PLATFORM_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */