inmates: Add IOAPIC service to inmates framework

This provides the functionality for programing an assigned IOAPIC pin to
send standard IRQs to the caller's CPU. Just enough for basic IOAPIC
usage.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

diff --git a/inmates/lib/x86/inmate.h b/inmates/lib/x86/inmate.h
index 66e043730a6a5e8fd5c72f245eaa0c60c15c64bc..a9f915d0036e81ad1edb3ed09b0b62fca9579a0c 100644 (file)
--- a/inmates/lib/x86/inmate.h
+++ b/inmates/lib/x86/inmate.h
@@ -180,6 +180,17 @@ typedef void(*int_handler_t)(void);
 void int_init(void);
 void int_set_handler(unsigned int vector, int_handler_t handler);
 
+enum ioapic_trigger_mode {
+       TRIGGER_EDGE = 0,
+       TRIGGER_LEVEL_ACTIVE_HIGH = 1 << 15,
+       TRIGGER_LEVEL_ACTIVE_LOW = (1 << 15) | (1 << 13),
+};
+
+void ioapic_init(void);
+void ioapic_pin_set_vector(unsigned int pin,
+                          enum ioapic_trigger_mode trigger_mode,
+                          unsigned int vector);
+
 void inmate_main(void);
 
 unsigned long pm_timer_read(void);

diff --git a/inmates/lib/x86/ioapic.c b/inmates/lib/x86/ioapic.c
new file mode 100644 (file)
index 0000000..de96e21
--- /dev/null
+++ b/inmates/lib/x86/ioapic.c
@@ -0,0 +1,36 @@
+/*
+ * Jailhouse, a Linux-based partitioning hypervisor
+ *
+ * Copyright (c) Siemens AG, 2014
+ *
+ * Authors:
+ *  Jan Kiszka <jan.kiszka@siemens.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include <inmate.h>
+
+#define IOAPIC_BASE            ((void *)0xfec00000)
+#define IOAPIC_REG_INDEX       0x00
+#define IOAPIC_REG_DATA                0x10
+#define IOAPIC_REDIR_TBL_START 0x10
+
+void ioapic_init(void)
+{
+       map_range(IOAPIC_BASE, PAGE_SIZE, MAP_UNCACHED);
+}
+
+void ioapic_pin_set_vector(unsigned int pin,
+                          enum ioapic_trigger_mode trigger_mode,
+                          unsigned int vector)
+{
+       mmio_write32(IOAPIC_BASE + IOAPIC_REG_INDEX,
+                    IOAPIC_REDIR_TBL_START + pin * 2 + 1);
+       mmio_write32(IOAPIC_BASE + IOAPIC_REG_DATA, cpu_id() << (56 - 32));
+
+       mmio_write32(IOAPIC_BASE + IOAPIC_REG_INDEX,
+                    IOAPIC_REDIR_TBL_START + pin * 2);
+       mmio_write32(IOAPIC_BASE + IOAPIC_REG_DATA, trigger_mode | vector);
+}