First shot at factoring SMM code into generic parts and southbridge specific

[coreboot.git] / src / cpu / x86 / smm / smihandler.c

diff --git a/src/cpu/x86/smm/smihandler.c b/src/cpu/x86/smm/smihandler.c
new file mode 100644 (file)
index 0000000..0dc8926
--- /dev/null
+++ b/src/cpu/x86/smm/smihandler.c
@@ -0,0 +1,203 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008 coresystems GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <arch/romcc_io.h>
+#include <console/console.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/smm.h>
+
+void southbridge_smi_set_eos(void);
+
+#define DEBUG_SMI
+
+typedef enum { SMI_LOCKED, SMI_UNLOCKED } smi_semaphore;
+
+/* SMI multiprocessing semaphore */
+static volatile smi_semaphore smi_handler_status = SMI_UNLOCKED;
+
+static int smi_obtain_lock(void)
+{
+       u8 ret = SMI_LOCKED;
+
+       asm volatile (
+               "movb %2, %%al\n"
+               "xchgb %%al, %1\n"
+               "movb %%al, %0\n"
+               : "=g" (ret), "=m" (smi_handler_status)
+               : "g" (SMI_LOCKED)
+               : "eax"
+       );
+
+       return (ret == SMI_UNLOCKED);
+}
+
+static void smi_release_lock(void)
+{
+       asm volatile (
+               "movb %1, %%al\n"
+               "xchgb %%al, %0\n"
+               : "=m" (smi_handler_status)
+               : "g" (SMI_UNLOCKED)
+               : "eax"
+       );
+}
+
+#define LAPIC_ID 0xfee00020
+static inline __attribute__((always_inline)) unsigned long nodeid(void)
+{
+       return (*((volatile unsigned long *)(LAPIC_ID)) >> 24);
+}
+
+/* ********************* smi_util ************************* */
+
+/* Data */
+#define UART_RBR 0x00
+#define UART_TBR 0x00
+
+/* Control */
+#define UART_IER 0x01
+#define UART_IIR 0x02
+#define UART_FCR 0x02
+#define UART_LCR 0x03
+#define UART_MCR 0x04
+#define UART_DLL 0x00
+#define UART_DLM 0x01
+
+/* Status */
+#define UART_LSR 0x05
+#define UART_MSR 0x06
+#define UART_SCR 0x07
+
+static int uart_can_tx_byte(void)
+{
+       return inb(TTYS0_BASE + UART_LSR) & 0x20;
+}
+
+static void uart_wait_to_tx_byte(void)
+{
+       while(!uart_can_tx_byte()) 
+       ;
+}
+
+static void uart_wait_until_sent(void)
+{
+       while(!(inb(TTYS0_BASE + UART_LSR) & 0x40))
+       ; 
+}
+
+static void uart_tx_byte(unsigned char data)
+{
+       uart_wait_to_tx_byte();
+       outb(data, TTYS0_BASE + UART_TBR);
+       /* Make certain the data clears the fifos */
+       uart_wait_until_sent();
+}
+
+void console_tx_flush(void)
+{
+       uart_wait_to_tx_byte();
+}
+
+void console_tx_byte(unsigned char byte)
+{
+       if (byte == '\n')
+               uart_tx_byte('\r');
+       uart_tx_byte(byte);
+}
+
+/* ********************* smi_util ************************* */
+
+
+void io_trap_handler(int smif)
+{
+       southbridge_io_trap_handler(smif);
+}
+
+/**
+ * @brief Set the EOS bit
+ */
+static void smi_set_eos(void)
+{
+       southbridge_smi_set_eos();
+}
+
+/**
+ * @brief Interrupt handler for SMI#
+ *
+ * @param smm_revision revision of the smm state save map
+ */
+
+void smi_handler(u32 smm_revision)
+{
+       u8 reg8;
+       u16 pmctrl;
+       u16 pm1_sts;
+       u32 smi_sts, gpe0_sts, tco_sts;
+       unsigned int node;
+       smm_state_save_area_t state_save;
+
+       /* Are we ok to execute the handler? */
+       if (!smi_obtain_lock())
+               return;
+
+       node=nodeid();
+
+#ifdef DEBUG_SMI
+       console_loglevel = DEFAULT_CONSOLE_LOGLEVEL;
+#else
+       console_loglevel = 1;
+#endif
+
+       printk_debug("\nSMI# #%d\n", node);
+
+       switch (smm_revision) {
+       case 0x00030007:
+               state_save.type = LEGACY;
+               state_save.legacy_state_save = (legacy_smm_state_save_area_t *)
+                       (0xa8000 + 0x7e00 - (node * 0x400));
+               break;
+       case 0x00030100:
+               state_save.type = EM64T;
+               state_save.em64t_state_save = (em64t_smm_state_save_area_t *)
+                       (0xa8000 + 0x7d00 - (node * 0x400));
+               break;
+       case 0x00030064:
+               state_save.type = AMD64;
+               state_save.amd64_state_save = (amd64_smm_state_save_area_t *)
+                       (0xa8000 + 0x7e00 - (node * 0x400));
+               break;
+       default:
+               printk_debug("smm_revision: 0x%08x\n", smm_revision);
+               printk_debug("SMI# not supported on your CPU\n");
+               /* Don't release lock, so no further SMI will happen,
+                * if we don't handle it anyways.
+                */
+               return;
+       }
+
+       southbridge_smi_handler(node, &state_save);
+
+       smi_release_lock();
+
+       /* De-assert SMI# signal to allow another SMI */
+       smi_set_eos();
+}