marssaxman/startc

startc is a minimal freestanding C runtime library for a 32-bit i386 PC.
Its job is to put the machine in a state which can be comfortably programmed
using ordinary C semantics, without constraining the application programmer's
architectural policy choices.

Picking up where a stage-2 bootloader leaves off, startc will configure the
memory model for a flat address space, configure the interrupt controller so
that IRQs can be distinguished from CPU exceptions, and install an interrupt
table equipped with forwarding stubs that invoke application-provided handlers.

After setup work, startc allocates a 16K bootstrap stack and jumps to the
application entrypoint.

The include/ directory contains a set of header files sufficient for a
conforming freestanding implementation of C99. The include/startc/ subdirectory
exposes the library's data structures and entrypoint signatures.

Finally, startc implements memmove, memcpy, memcmp, and memset, which GCC
requires a freestanding library implementation to provide. These are declared
as weak symbols so that the application can easily override them.

'make hello' builds a simple demonstration executable.
'make demo' launches the demo executable via qemu.