19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright 2019 Peter Tribble.
  27  */
  28 
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31 #include <sys/fcntl.h>
  32 #include <sys/promif.h>
  33 #include <sys/prom_plat.h>
  34 #include <sys/salib.h>
  35 
  36 extern int is_sun4v;
  37 
  38 /*
  39  * Check if the CPU should default to 64-bit or not.
  40  * UltraSPARC-1's default to 32-bit mode.
  41  * Everything else defaults to 64-bit mode.
  42  */
  43 
  44 /*
  45  * Manufacturer codes for the CPUs we're interested in
  46  */
  47 #define TI_JEDEC        0x17
  48 #define SUNW_JEDEC      0x22
  49 
  50 /*
  51  * Implementation codes for the CPUs we're interested in
  52  */
  53 #define IMPL_US_I       0x10
  54 
  55 static pnode_t
  56 visit(pnode_t node)
  57 {
  58         int impl, manu;
  59         char name[32];
  60         static char ultrasparc[] = "SUNW,UltraSPARC";
  61         static char implementation[] = "implementation#";
  62         static char manufacturer[] = "manufacturer#";
  63 
  64         /*
  65          * if name isn't 'SUNW,UltraSPARC', continue.
  66          */
  67         if (prom_getproplen(node, "name") != sizeof (ultrasparc))
  68                 return ((pnode_t)0);
  69         (void) prom_getprop(node, "name", name);
  70         if (strncmp(name, ultrasparc, sizeof (ultrasparc)) != 0)
  71                 return ((pnode_t)0);
  72 
  73         if (prom_getproplen(node, manufacturer) != sizeof (int))
  74                 return ((pnode_t)0);
  75         (void) prom_getprop(node, manufacturer, (caddr_t)&manu);
  76 
  77         if ((manu != SUNW_JEDEC) && (manu != TI_JEDEC))
  78                 return ((pnode_t)0);
  79 
  80         if (prom_getproplen(node, implementation) != sizeof (int))
  81                 return ((pnode_t)0);
  82         (void) prom_getprop(node, implementation, (caddr_t)&impl);
  83 
  84         if (impl != IMPL_US_I)
  85                 return ((pnode_t)0);
  86 
  87         return (node);
  88 }
  89 
  90 /*
  91  * visit each node in the device tree, until we get a non-null answer
  92  */
  93 static pnode_t
  94 walk(pnode_t node)
  95 {
  96         pnode_t id;
  97 
  98         if (visit(node))
  99                 return (node);
 100 
 101         for (node = prom_childnode(node); node; node = prom_nextnode(node))
 102                 if ((id = walk(node)) != (pnode_t)0)
 103                         return (id);
 104 
 105         return ((pnode_t)0);
 106 }
 107 
 108 /*
 109  * Check if the CPU is an UltraSPARC-1 or not.
 110  */
 111 int
 112 cpu_is_ultrasparc_1(void)
 113 {
 114         static int cpu_checked;
 115         static int cpu_default;
 116 
 117         /*
 118          * If we already checked or the machine is
 119          * a sun4v, we already know the answer.
 120          */
 121         if (!is_sun4v || cpu_checked == 0) {
 122                 if (walk(prom_rootnode()))
 123                         cpu_default = 1;
 124                 cpu_checked = 1;
 125         }
 126 
 127         return (cpu_default);
 128 }
 129 
 130 /*
 131  * Retain a page or reclaim a previously retained page of physical
 132  * memory for use by the prom upgrade. If successful, leave
 133  * an indication that a page was retained by creating a boolean
 134  * property in the root node.
 135  *
 136  * XXX: SUNW,retain doesn't work as expected on server systems,
 137  * so we don't try to retain any memory on those systems.
 138  *
 139  * XXX: do a '0 to my-self' as a workaround for 4160914
 140  */
 141 
 142 int dont_retain_memory;
 143 
 144 void
 145 retain_nvram_page(void)
 146 {
 147         unsigned long long phys = 0;
 148         int len;
 149         char name[32];
 150         static char create_prop[] =

  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright 2019 Peter Tribble.
  27  */
  28 
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31 #include <sys/fcntl.h>
  32 #include <sys/promif.h>
  33 #include <sys/prom_plat.h>
  34 #include <sys/salib.h>
  35 
  36 extern int is_sun4v;
  37 
  38 /*




























































































  39  * Retain a page or reclaim a previously retained page of physical
  40  * memory for use by the prom upgrade. If successful, leave
  41  * an indication that a page was retained by creating a boolean
  42  * property in the root node.
  43  *
  44  * XXX: SUNW,retain doesn't work as expected on server systems,
  45  * so we don't try to retain any memory on those systems.
  46  *
  47  * XXX: do a '0 to my-self' as a workaround for 4160914
  48  */
  49 
  50 int dont_retain_memory;
  51 
  52 void
  53 retain_nvram_page(void)
  54 {
  55         unsigned long long phys = 0;
  56         int len;
  57         char name[32];
  58         static char create_prop[] =