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-rw-r--r--src/arch/x86/boot/acpigen.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/src/arch/x86/boot/acpigen.c b/src/arch/x86/boot/acpigen.c
index fdb7e02c9b..ba3d2dfe46 100644
--- a/src/arch/x86/boot/acpigen.c
+++ b/src/arch/x86/boot/acpigen.c
@@ -754,3 +754,37 @@ int acpigen_write_mainboard_resources(const char *scope, const char *name)
acpigen_patch_len(len - 1);
return len;
}
+
+static int hex2bin(const char c)
+{
+ if (c >= 'A' && c <= 'F')
+ return c - 'A' + 10;
+ if (c >= 'a' && c <= 'f')
+ return c - 'a' + 10;
+ return c - '0';
+}
+
+int acpigen_emit_eisaid(const char *eisaid)
+{
+ u32 compact = 0;
+
+ /* Clamping individual values would be better but
+ there is a disagreement over what is a valid
+ EISA id, so accept anything and don't clamp,
+ parent code should create a valid EISAid.
+ */
+ compact |= (eisaid[0] - 'A' + 1) << 26;
+ compact |= (eisaid[1] - 'A' + 1) << 21;
+ compact |= (eisaid[2] - 'A' + 1) << 16;
+ compact |= hex2bin(eisaid[3]) << 12;
+ compact |= hex2bin(eisaid[4]) << 8;
+ compact |= hex2bin(eisaid[5]) << 4;
+ compact |= hex2bin(eisaid[6]);
+
+ acpigen_emit_byte(0xc);
+ acpigen_emit_byte((compact >> 24) & 0xff);
+ acpigen_emit_byte((compact >> 16) & 0xff);
+ acpigen_emit_byte((compact >> 8) & 0xff);
+ acpigen_emit_byte(compact & 0xff);
+ return 5;
+}