From: Diego Domingos <diegodo@linux.vnet.ibm.com>
Date: Mon, 6 Feb 2023 15:03:23 +0000 (-0500)
Subject: ieee1275: Implement vec5 for cas negotiation
X-Git-Tag: grub-2.12-rc1~117
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b4d91185b7d42430b11cf9903b2a00e6451023e;p=thirdparty%2Fgrub.git

ieee1275: Implement vec5 for cas negotiation

As a legacy support, if the vector 5 is not implemented, Power Hypervisor will
consider the max CPUs as 64 instead 256 currently supported during
client-architecture-support negotiation.

This patch implements the vector 5 and set the MAX CPUs to 256 while setting the
others values to 0 (default).

Signed-off-by: Diego Domingos <diegodo@linux.vnet.ibm.com>
Acked-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Avnish Chouhan <avnish@linux.vnet.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Reviewed-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---

diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index 726fcdd36..7337e289d 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -500,6 +500,19 @@ struct option_vector2
   grub_uint8_t max_pft_size;
 } GRUB_PACKED;
 
+struct option_vector5
+{
+  grub_uint8_t byte1;
+  grub_uint8_t byte2;
+  grub_uint8_t byte3;
+  grub_uint8_t cmo;
+  grub_uint8_t associativity;
+  grub_uint8_t bin_opts;
+  grub_uint8_t micro_checkpoint;
+  grub_uint8_t reserved0;
+  grub_uint32_t max_cpus;
+} GRUB_PACKED;
+
 struct pvr_entry
 {
   grub_uint32_t mask;
@@ -521,6 +534,8 @@ struct cas_vector
   grub_uint16_t vec3;
   grub_uint8_t vec4_size;
   grub_uint16_t vec4;
+  grub_uint8_t vec5_size;
+  struct option_vector5 vec5;
 } GRUB_PACKED;
 
 /*
@@ -545,7 +560,7 @@ grub_ieee1275_ibm_cas (void)
   struct cas_vector vector =
   {
     .pvr_list = { { 0x00000000, 0xffffffff } }, /* any processor */
-    .num_vecs = 4 - 1,
+    .num_vecs = 5 - 1,
     .vec1_size = 0,
     .vec1 = 0x80, /* ignore */
     .vec2_size = 1 + sizeof (struct option_vector2) - 2,
@@ -556,6 +571,10 @@ grub_ieee1275_ibm_cas (void)
     .vec3 = 0x00e0, /* ask for FP + VMX + DFP but don't halt if unsatisfied */
     .vec4_size = 2 - 1,
     .vec4 = 0x0001, /* set required minimum capacity % to the lowest value */
+    .vec5_size = 1 + sizeof (struct option_vector5) - 2,
+    .vec5 = {
+      0, 192, 0, 128, 0, 0, 0, 0, 256
+    }
   };
 
   INIT_IEEE1275_COMMON (&args.common, "call-method", 3, 2);