arch/tile: core support for Tilera 32-bit chips.

This change is the core kernel support for TILEPro and TILE64 chips.
No driver support (except the console driver) is included yet.

This includes the relevant Linux headers in asm/; the low-level
low-level "Tile architecture" headers in arch/, which are
shared with the hypervisor, etc., and are build-system agnostic;
and the relevant hypervisor headers in hv/.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 93 insertions, 0 deletions

diff --git a/arch/tile/include/arch/abi.h b/arch/tile/include/arch/abi.h
new file mode 100644
index 000000000000..7cdc47b3e02a
--- /dev/null
+++ b/arch/tile/include/arch/abi.h
@@ -0,0 +1,93 @@
+// Copyright 2010 Tilera Corporation. All Rights Reserved.
+//
+//   This program is free software; you can redistribute it and/or
+//   modify it under the terms of the GNU General Public License
+//   as published by the Free Software Foundation, version 2.
+//
+//   This program is distributed in the hope that it will be useful, but
+//   WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+//   NON INFRINGEMENT.  See the GNU General Public License for
+//   more details.
+
+//! @file
+//!
+//! ABI-related register definitions helpful when writing assembly code.
+//!
+
+#ifndef __ARCH_ABI_H__
+#define __ARCH_ABI_H__
+
+#include <arch/chip.h>
+
+// Registers 0 - 55 are "normal", but some perform special roles.
+
+#define TREG_FP       52   /**< Frame pointer. */
+#define TREG_TP       53   /**< Thread pointer. */
+#define TREG_SP       54   /**< Stack pointer. */
+#define TREG_LR       55   /**< Link to calling function PC. */
+
+/** Index of last normal general-purpose register. */
+#define TREG_LAST_GPR 55
+
+// Registers 56 - 62 are "special" network registers.
+
+#define TREG_SN       56   /**< Static network access. */
+#define TREG_IDN0     57   /**< IDN demux 0 access. */
+#define TREG_IDN1     58   /**< IDN demux 1 access. */
+#define TREG_UDN0     59   /**< UDN demux 0 access. */
+#define TREG_UDN1     60   /**< UDN demux 1 access. */
+#define TREG_UDN2     61   /**< UDN demux 2 access. */
+#define TREG_UDN3     62   /**< UDN demux 3 access. */
+
+// Register 63 is the "special" zero register.
+
+#define TREG_ZERO     63   /**< "Zero" register; always reads as "0". */
+
+
+/** By convention, this register is used to hold the syscall number. */
+#define TREG_SYSCALL_NR      10
+
+/** Name of register that holds the syscall number, for use in assembly. */
+#define TREG_SYSCALL_NR_NAME r10
+
+
+//! The ABI requires callers to allocate a caller state save area of
+//! this many bytes at the bottom of each stack frame.
+//!
+#ifdef __tile__
+#define C_ABI_SAVE_AREA_SIZE (2 * __SIZEOF_POINTER__)
+#endif
+
+//! The operand to an 'info' opcode directing the backtracer to not
+//! try to find the calling frame.
+//!
+#define INFO_OP_CANNOT_BACKTRACE 2
+
+#ifndef __ASSEMBLER__
+#if CHIP_WORD_SIZE() > 32
+
+//! Unsigned type that can hold a register.
+typedef unsigned long long uint_reg_t;
+
+//! Signed type that can hold a register.
+typedef long long int_reg_t;
+
+//! String prefix to use for printf().
+#define INT_REG_FMT "ll"
+
+#elif !defined(__LP64__)   /* avoid confusion with LP64 cross-build tools */
+
+//! Unsigned type that can hold a register.
+typedef unsigned long uint_reg_t;
+
+//! Signed type that can hold a register.
+typedef long int_reg_t;
+
+//! String prefix to use for printf().
+#define INT_REG_FMT "l"
+
+#endif
+#endif /* __ASSEMBLER__ */
+
+#endif // !__ARCH_ABI_H__