arch/x86/acpigen: Add generator for _ROM
Generate ACPI AML code for _ROM method.
This function takes as input ROM data and ROM length.
Arguments passed into _DSM method:
Arg0 = Offset in Bytes
Arg1 = Bytes to return
Example:
acpigen_write_rom(0xdeadbeef, 0x10000)
AML code generated would look like:
Method (_ROM, 2, NotSerialized) // _ROM: Read-Only Memory
{
OperationRegion (ROMS, SystemMemory, 0xdeadbeef, 0x00010000)
Field (ROMS, AnyAcc, NoLock, Preserve)
{
Offset (0x00),
RBF0, 524288
}
Local0 = Arg0
Local1 = Arg1
If (Local1 > 0x1000)
{
Local1 = 0x1000
}
If (Local0 > 0x00010000)
{
Return (Buffer (Local1)
{
0x00
})
}
If (Local0 > 0x0f000)
{
Local2 = 0x10000 - Local0
If (Local1 > Local2)
{
Local1 = Local2
}
}
Name (ROM1, Buffer (Local1)
{
0x00
})
Local1 *= 0x08
Local0 *= 0x08
CreateField (RBF0, Local0, Local1, TMPB)
ROM1 = TMPB /* \_SB_.PCI0.GFX0._ROM.TMPB */
Return (ROM1) /* \_SB_.PCI0.GFX0._ROM.ROM1 */
}
Change-Id: Ie118b15257295b7133c8e585c0fd5218249dec8d
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20547
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index 9637b7d..bdb73bf 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -1311,6 +1311,198 @@
acpigen_pop_len(); /* Method _DSM */
}
+/*
+ * Generate ACPI AML code for _ROM method.
+ * This function takes as input ROM data and ROM length.
+ *
+ * Arguments passed into _DSM method:
+ * Arg0 = Offset in Bytes
+ * Arg1 = Bytes to return
+ *
+ * Example:
+ * acpigen_write_rom(0xdeadbeef, 0x10000)
+ *
+ * AML code generated would look like:
+ * Method (_ROM, 2, NotSerialized) {
+ *
+ * OperationRegion("ROMS", SYSTEMMEMORY, 0xdeadbeef, 0x10000)
+ * Field (ROMS, AnyAcc, NoLock, Preserve)
+ * {
+ * Offset (0),
+ * RBF0, 0x80000
+ * }
+ *
+ * Store (Arg0, Local0)
+ * Store (Arg1, Local1)
+ *
+ * If (LGreater (Local1, 0x1000))
+ * {
+ * Store (0x1000, Local1)
+ * }
+ *
+ * If (LGreater (Local0, 0x10000))
+ * {
+ * Return(Buffer(Local1){0})
+ * }
+ *
+ * If (LGreater (Local0, 0x0f000))
+ * {
+ * Subtract (0x10000, Local0, Local2)
+ * If (LGreater (Local1, Local2))
+ * {
+ * Store (Local2, Local1)
+ * }
+ * }
+ *
+ * Name (ROM1, Buffer (Local1) {0})
+ *
+ * Multiply (Local0, 0x08, Local0)
+ * Multiply (Local1, 0x08, Local1)
+ *
+ * CreateField (RBF0, Local0, Local1, TMPB)
+ * Store (TMPB, ROM1)
+ * Return (ROM1)
+ * }
+ */
+
+void acpigen_write_rom(void *bios, const size_t length)
+{
+ ASSERT(bios)
+ ASSERT(length)
+
+ /* Method (_ROM, 2, NotSerialized) */
+ acpigen_write_method("_ROM", 2);
+
+ /* OperationRegion("ROMS", SYSTEMMEMORY, current, length) */
+ struct opregion opreg = OPREGION("ROMS", SYSTEMMEMORY,
+ (uintptr_t)bios, length);
+ acpigen_write_opregion(&opreg);
+
+ struct fieldlist l[] = {
+ FIELDLIST_OFFSET(0),
+ FIELDLIST_NAMESTR("RBF0", 8 * length),
+ };
+
+ /* Field (ROMS, AnyAcc, NoLock, Preserve)
+ * {
+ * Offset (0),
+ * RBF0, 0x80000
+ * } */
+ acpigen_write_field(opreg.name, l, 2, FIELD_ANYACC |
+ FIELD_NOLOCK | FIELD_PRESERVE);
+
+ /* Store (Arg0, Local0) */
+ acpigen_write_store();
+ acpigen_emit_byte(ARG0_OP);
+ acpigen_emit_byte(LOCAL0_OP);
+
+ /* Store (Arg1, Local1) */
+ acpigen_write_store();
+ acpigen_emit_byte(ARG1_OP);
+ acpigen_emit_byte(LOCAL1_OP);
+
+ /* ACPI SPEC requires to return at maximum 4KiB */
+ /* If (LGreater (Local1, 0x1000)) */
+ acpigen_write_if();
+ acpigen_emit_byte(LGREATER_OP);
+ acpigen_emit_byte(LOCAL1_OP);
+ acpigen_write_integer(0x1000);
+
+ /* Store (0x1000, Local1) */
+ acpigen_write_store();
+ acpigen_write_integer(0x1000);
+ acpigen_emit_byte(LOCAL1_OP);
+
+ /* Pop if */
+ acpigen_pop_len();
+
+ /* If (LGreater (Local0, length)) */
+ acpigen_write_if();
+ acpigen_emit_byte(LGREATER_OP);
+ acpigen_emit_byte(LOCAL0_OP);
+ acpigen_write_integer(length);
+
+ /* Return(Buffer(Local1){0}) */
+ acpigen_emit_byte(RETURN_OP);
+ acpigen_emit_byte(BUFFER_OP);
+ acpigen_write_len_f();
+ acpigen_emit_byte(LOCAL1_OP);
+ acpigen_emit_byte(0);
+ acpigen_pop_len();
+
+ /* Pop if */
+ acpigen_pop_len();
+
+ /* If (LGreater (Local0, length - 4096)) */
+ acpigen_write_if();
+ acpigen_emit_byte(LGREATER_OP);
+ acpigen_emit_byte(LOCAL0_OP);
+ acpigen_write_integer(length - 4096);
+
+ /* Subtract (length, Local0, Local2) */
+ acpigen_emit_byte(SUBTRACT_OP);
+ acpigen_write_integer(length);
+ acpigen_emit_byte(LOCAL0_OP);
+ acpigen_emit_byte(LOCAL2_OP);
+
+ /* If (LGreater (Local1, Local2)) */
+ acpigen_write_if();
+ acpigen_emit_byte(LGREATER_OP);
+ acpigen_emit_byte(LOCAL1_OP);
+ acpigen_emit_byte(LOCAL2_OP);
+
+ /* Store (Local2, Local1) */
+ acpigen_write_store();
+ acpigen_emit_byte(LOCAL2_OP);
+ acpigen_emit_byte(LOCAL1_OP);
+
+ /* Pop if */
+ acpigen_pop_len();
+
+ /* Pop if */
+ acpigen_pop_len();
+
+ /* Name (ROM1, Buffer (Local1) {0}) */
+ acpigen_write_name("ROM1");
+ acpigen_emit_byte(BUFFER_OP);
+ acpigen_write_len_f();
+ acpigen_emit_byte(LOCAL1_OP);
+ acpigen_emit_byte(0);
+ acpigen_pop_len();
+
+ /* Multiply (Local1, 0x08, Local1) */
+ acpigen_emit_byte(MULTIPLY_OP);
+ acpigen_emit_byte(LOCAL1_OP);
+ acpigen_write_integer(0x08);
+ acpigen_emit_byte(LOCAL1_OP);
+
+ /* Multiply (Local0, 0x08, Local0) */
+ acpigen_emit_byte(MULTIPLY_OP);
+ acpigen_emit_byte(LOCAL0_OP);
+ acpigen_write_integer(0x08);
+ acpigen_emit_byte(LOCAL0_OP);
+
+ /* CreateField (RBF0, Local0, Local1, TMPB) */
+ acpigen_emit_ext_op(CREATEFIELD_OP);
+ acpigen_emit_namestring("RBF0");
+ acpigen_emit_byte(LOCAL0_OP);
+ acpigen_emit_byte(LOCAL1_OP);
+ acpigen_emit_namestring("TMPB");
+
+ /* Store (TMPB, ROM1) */
+ acpigen_write_store();
+ acpigen_emit_namestring("TMPB");
+ acpigen_emit_namestring("ROM1");
+
+ /* Return (ROM1) */
+ acpigen_emit_byte(RETURN_OP);
+ acpigen_emit_namestring("ROM1");
+
+ /* Pop method */
+ acpigen_pop_len();
+}
+
+
/* Soc-implemented functions -- weak definitions. */
int __attribute__((weak)) acpigen_soc_read_rx_gpio(unsigned int gpio_num)
{