From: Alec Brown <alec.r.br...@oracle.com>
Add base code for PSP discovery in grub.
Signed-off-by: Alec Brown <alec.r.br...@oracle.com>
Signed-off-by: Sergii Dmytruk <sergii.dmyt...@3mdeb.com>
---
grub-core/Makefile.core.def | 1 +
grub-core/loader/slaunch/psp.c | 133 +++++++++++++++++++++++++++++++++
include/grub/i386/psp.h | 42 +++++++++++
3 files changed, 176 insertions(+)
create mode 100644 grub-core/loader/slaunch/psp.c
create mode 100644 include/grub/i386/psp.h
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index aba480842..dabf8fb22 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1883,6 +1883,7 @@ module = {
x86 = loader/slaunch/acmod.c;
x86 = loader/slaunch/verify.c;
x86 = loader/slaunch/i386_linux.c;
+ x86 = loader/slaunch/psp.c;
x86 = loader/slaunch/dlstub.c;
x86 = loader/efi/dltrampoline.S;
x86_64_efi = loader/slaunch/x86_efi_linux.c;
diff --git a/grub-core/loader/slaunch/psp.c b/grub-core/loader/slaunch/psp.c
new file mode 100644
index 000000000..3459f7e34
--- /dev/null
+++ b/grub-core/loader/slaunch/psp.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of the Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+#include <grub/pci.h>
+#include <grub/i386/pci.h>
+#include <grub/i386/psp.h>
+
+struct psp_drtm_interface
+{
+ volatile grub_uint32_t *c2pmsg_72;
+ volatile grub_uint32_t *c2pmsg_93;
+ volatile grub_uint32_t *c2pmsg_94;
+ volatile grub_uint32_t *c2pmsg_95;
+};
+
+typedef enum
+{
+ PSP_NONE = 0,
+ PSP_V1,
+ PSP_V2,
+ PSP_V3
+} psp_version_t;
+
+static psp_version_t psp_version;
+static struct psp_drtm_interface psp_drtm;
+
+static grub_err_t init_drtm_interface (grub_addr_t base_addr, psp_version_t
version);
+
+static void
+smn_register_read (grub_uint32_t address, grub_uint32_t *value)
+{
+ grub_pci_device_t dev = {0, 0, 0};
+ grub_pci_address_t addr;
+ grub_uint32_t val;
+
+ val = address;
+ addr = grub_pci_make_address (dev, 0xb8);
+ grub_pci_write (addr, val);
+ addr = grub_pci_make_address (dev, 0xbc);
+ val = grub_pci_read (addr);
+ *value = val;
+}
+
+#define IOHC0NBCFG_SMNBASE 0x13b00000
+#define PSP_BASE_ADDR_LO_SMN_ADDRESS (IOHC0NBCFG_SMNBASE + 0x102e0)
+
+static grub_uint64_t
+get_psp_bar_addr (void)
+{
+ grub_uint32_t pspbaselo;
+
+ pspbaselo = 0;
+ smn_register_read (PSP_BASE_ADDR_LO_SMN_ADDRESS, &pspbaselo);
+
+ /* Mask out the lower bits */
+ pspbaselo &= 0xfff00000;
+ return (grub_uint64_t) pspbaselo;
+}
+
+grub_err_t
+grub_psp_discover (void)
+{
+ grub_uint64_t bar2_addr = 0;
+ grub_err_t err;
+
+ bar2_addr = get_psp_bar_addr();
+ if (!bar2_addr)
+ return grub_error (GRUB_ERR_BAD_DEVICE, N_("DRTM: failed to find PSP\n"));
+
+ err = init_drtm_interface (bar2_addr, PSP_V2);
+ if (err)
+ return err;
+
+ psp_version = PSP_V2;
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+init_drtm_interface (grub_addr_t base_addr, psp_version_t version)
+{
+ switch (version)
+ {
+ case PSP_V2:
+ case PSP_V3:
+ psp_drtm.c2pmsg_72 = (volatile grub_uint32_t *)(base_addr + 0x10a20);
+ psp_drtm.c2pmsg_93 = (volatile grub_uint32_t *)(base_addr + 0x10a74);
+ psp_drtm.c2pmsg_94 = (volatile grub_uint32_t *)(base_addr + 0x10a78);
+ psp_drtm.c2pmsg_95 = (volatile grub_uint32_t *)(base_addr + 0x10a7c);
+ break;
+ default:
+ return grub_error (GRUB_ERR_BAD_DEVICE, N_("DRTM: Unrecognized PSP
version %d\n"), version);
+ }
+
+ return GRUB_ERR_NONE;
+}
+
+grub_uint16_t
+grub_psp_version (void)
+{
+ return psp_version;
+}
diff --git a/include/grub/i386/psp.h b/include/grub/i386/psp.h
new file mode 100644
index 000000000..8373318ca
--- /dev/null
+++ b/include/grub/i386/psp.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of the Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __PSP_H__
+#define __PSP_H__
+
+#include <grub/err.h>
+#include <grub/types.h>
+
+extern grub_err_t grub_psp_discover (void);
+extern grub_uint16_t grub_psp_version (void);
+
+#endif /* __PSP_H__ */
--
2.47.1
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