mirror of
git://projects.qi-hardware.com/iris.git
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67 lines
2.0 KiB
COBOL
67 lines
2.0 KiB
COBOL
#pypp 0
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// Iris: micro-kernel for a capability-based operating system.
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// mips/nanonote/sdram-setup.ccp: bootstrapping over usb.
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// Copyright 2009 Bas Wijnen <wijnen@debian.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// This runs like the kernel. In particular, it doesn't want userspace declarations.
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#define __KERNEL__
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#define dbg_log_char(x) do {} while (0)
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#define dbg_log(x) do {} while (0)
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#define dbg_log_num(...) do {} while (0)
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// Set up gp and sp, jump to start_cpp().
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// This must be the first code in the file,
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// so also before include jz4740.hh,
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// because that defines some static functions which may not be inlined.
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asm volatile (".set noreorder\n"
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".globl __start\n"
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".text\n"
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"__start:\n"
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"\tmove $t0, $ra\n" // 0
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"\tnop\n" // 4
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"\tbal 1f\n" // 8
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"\tnop\n" // 12
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"\t.word _gp\n" // 16
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"\t.word 0\n" // 20: This is overwritten in software usbboot mode.
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"1:\n"
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"\tlw $gp, 0($ra)\n"
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"\tlb $a0, 4($ra)\n"
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"\tla $sp, stack + 0x40\n"
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"\tla $t9, start_cpp\n"
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"\tmove $ra, $t0\n"
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"\tjr $t9\n"
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"\tnop\n"
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".set reorder")
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#include "jz4740.hh"
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void kdebug (unsigned ch):
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while !(UART0_LSR & UARTLSR_TDRQ):
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UART0_TDR = ch
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while !(UART0_LSR & UARTLSR_TEMT):
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extern "C":
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void start_cpp (int skip_memsetup)
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char stack[0x40]
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void start_cpp (int skip_memsetup):
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setup_uart ()
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kdebug ('.')
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if !skip_memsetup:
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setup_sdram ()
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kdebug ('!')
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// everything is ok now: return to boot loader to load stage 2.
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